Benchmarking Raspberry Pi 4 Running From Power Over Ethernet


Introduction Summary General
Normal Power LAN Tests LanSpeed Short Cable LanSpeed Long Cables
Data Validation Long Cable Data Validation Long Thin Cable
Power over Ethernet LAN Tests PoE LanSpeed Long Cables PoE Data Validation Long Cable
PoE Data Validation Thin Cable
CPU Stress Tests Floating Point Voltage Check Integer Test Voltage Check
PoE Stress Tests With USB 3 Drives

Terminal Remote Control One Wire PoE, Windows 7 & PuTTy One Wire PoE Windows 10 & Phone
One Wire PoE No HAT or Fan, Linux One Wire PoE to Pi64 From Pi32
VNC Viewer Remote Control One Wire PoE Windows From Pi One Wire PoE Pi From Other Pi
Android Mobile Phone VNC Viewer


Summary

The objectives of this exercise were to compare network performance and power supply effects of Raspberry Pi 4 computers activated using PoE (Power over Ethernet) and normal power supplies, then to consider options for remote control to run programs on the Pi when the only cable connected supplied power via an Ethernet cable.

The main Raspberry Pi used was fitted with a PoE HAT that has a fan and converts Ethernet supplied power to that required to operate the Pi. Additional hardware obtained was unit that injects power on to the cable and one that converts the power in place of the HAT. The main cables used were combinations of three 48 metres CAT 6 (30+10+8) and 50 metres (30+10+10), the latter being a thin one (CAT 5?).

LAN Tests - These comprised using my LanSpeed benchmark and Burnindrive program. The former measures writing an reading speeds of large files, random access and small files and the latter creates files using numerous data patterns that are checked for data comparison failures on reading. The tests were run using normal power supplies, then using PoE, in both cases using 48 and 50 metre cable combinations.

LAN Tests Normal Power - Except where the thin cable was used, large file data transfer speeds clearly demonstrated Gigabit performance, perhaps a little slower with the long cable. The thin cable lead to a reduction in speed to 100 Mbps. In all cases, as expected, performance of random access and small files was awful. No data comparison errors were recorded during the Burnindrive tests, but thin cable tests were much slower, again.

LAN Tests PoE - Without the thin cable, performance could be a little slower than with normal power supplies, and there were no data errors. Including the thin cable, there were all sorts of issues, failing to run properly or the program crashing.

PoE High Power Consumption CPU Stress Tests - I ran my floating point and integer CPU stress tests that were known to consume the most power, using eight threads. These were run for 10 minutes and my CPU MHz, voltage and temperature monitoring program was run at the same time. Four tests of each were run using normal power, 48m thick cable, 50m including thin cable, with PoE HAT, and 50m with the alternative power converter. With the fan in use, there were only moderate increases in temperature and no CPU MHz throttling, with performance essentially constant and the same on all tests.

PoE CPU Stress Tests With USB 3 Hard Drive and USB 3 Flash Drive - It became clear on running these tests, that careful consideration of USB connection and activity might be needed with PoE. Using the 50 metre cable combination, with the thin one, caused crashes of stress testing program, without any USB activity, and also with the long thick cable, when attempting to use the hard drive.

Tests were carried out using normal power without and with hard disk activity, then using PoE, via the 48 metre thick cable combination, without and with flash drive data transfers. At least, these tests were all successful, with 100 MB/second data transfers having little impact on CPU performance (with USB activity for less than half of the time).

One Wire PoE Terminal Remote Control - Fully functionable Raspberry Pi Terminals were enabled on remote hardware. The Pi only had a single wire connected, an Ethernet cable with PoE, but without the power injector unit connected to an Ethernet hub, forcing WiFi intercommunication. Different ssh connection methods were required, using Windows 7, Windows 10, Linux (Raspbian and Ubuntu) and an Android smart phone. Screenshots from these, displaying various benchmark results and monitoring details, are provided.

The alternative PoE power converter was used for the Ubuntu test, for connection to a fanless Pi board. Two terminals were opened to run a CPU stress test and monitor MHz and temperature, using one thread, then eight. As expected, the latter suffered from MHz throttling, and the former at constant speed with moderate increases in temperature. This was to demonstrate that the cheaper, fanless PoE option could be adequate for some applications.

One Wire VNC Viewer Remote Control - Appropriate VNC Servers and Viewer software was installed on two Raspberry Pi 4s, a Windows PC and an Android smart phone, with a Server Pi having the same one wire connection as above. VNC Viewer provides remote desktop displays and full functionality. Using this facility, I ran my Raspberry Pi OpenGL benchmark with selection and dynamic display on a Windows monitor and a CPU benchmark with activities controlled by a remote Raspberry Pi. Finally, the Android phone was connected to monitor my JavaDraw benchmark, already running on the Server Pi. Screenshots are provided. as before.

Conclusions - At least, for the particular equipment used here, Power over Ethernet can be used over long cables (48 metres in this case), with little communications performance degradation and providing adequate power. Operation from remote computers and smart phones, with access to the same local network, is easy to apply, with realtime observation of normal output displayed by programs. Failure free usage can depend on avoiding the use of lower quality cables and such as USB connections that impose high, even transient, power demands.

Go To Start


General

I have a Raspberry Pi 4 cooled by the fan in a PoE HAT, initially unaware what PoE was all about. The fan does a great job for cooling purposes, as I reported at ResearchGate in Raspberry Pi 4B Stress Tests Including High Performance Linpack.pdf, but is rather expensive for use as just a fan.

Details of the PoE HAT are available in a raspberrypi.org publication. This clarified (to me) that the power to operate the Pi can be supplied over an Ethernet cable, but needs to have remote power-sourcing equipment available. What was not made clear is that the Pi can be used at a distance, with power and communication suppled by a single wire, or maybe just power, if WiFi is working. PoE standards indicate a distance limit of 100 metres.

The power source provides a high voltage, like up to 50 volts, for efficient transmission over a distance, the PoE HAT converting this to the required 5 volts at 2.5 amps.

In my ignorance and looking for inexpensive hardware, I bought a DSLRKIT Gigabit Ethernet Active PoE Splitter, costing 9.90 from Amazon, but this only provides the HAT voltage conversion and Ethernet connection. Tests have been run (or attempted) including this, instead of an HAT, but such devices should not really be used unless approved by raspberrypi.org.

Then I bought the real thing, a TP-LINK TL-PoE150S PoE Injector Adapter, including 48 volts, 0.5 amps power supply. This supports Gigabit Ethernet with one port in and one out, costing 16.99 from Amazon (I suppose that this should also be officially approved).

Tests were run using short and long cables measuring data transmission speeds and trying to indicated voltage limitations using stress testing programs, then using remote control to check single wire operation.

LanSpeed Benchmark Next or Go To Start


LanSpeed Benchmark - Normal Power, Short Cable

Network speeds are measured using my LanSpeed benchmark. This measures writing and reading MB/second for large files, milliseconds random reading and writing time of small blocks for a range of file sizes, plus average writing and reading performance of 200 small files, in terms of MB/second and milliseconds per file.

Commands

Following is the parameter to mount the remote file path, where the public folder was pre-allocated, then the execution command. In this case, the remote system was a PC using Windows 7. Note, M = 1048576 with the MB parameter for large files doubling for a second set. Maximum specified MB size is 1023 as 2048 produces a segmentation error, using Raspbian 32 bit Operating System, where maximum file size is 2 GB - 1 (parameter would be less than 1,023.9999995232).

 sudo mount -t cifs -o dir_mode=0777,file_mode=0777 //192.168.1.68/d/ray /media/public
./LanSpeed MB 1000 FilePath /media/public
Log File

Following is a copy of the text log file, saved in the same folder as the benchmark execution file. This is for the Raspberry Pi based program transferring data to/from the Windows 7 based PC via a short cable from the main hub. The same performance details are displayed as the test is running.

Large file data transfer speeds clearly demonstrated Gigabit performance. Note the slow results for small files and increase with file size.


 #####################################################

   LanSpeed RasPi 1.0 Mon Apr 13 16:15:23 2020
 
 Selected File Path: 
 /media/public/
 Total MB  266240, Free MB  157082, Used MB  109158

                        MBytes/Second
  MB   Write1   Write2   Write3    Read1    Read2    Read3

1000   111.56   108.91   108.29   110.60    92.45   108.48
2000   110.73   113.53   113.81    99.21   104.85   102.32

 Random         Read                       Write
 From MB        4        8       16        4        8       16
 msecs      0.007    0.011    0.052     0.93     1.30     0.98

 200 Files      Write                      Read                  Delete
 File KB        4        8       16        4        8       16     secs
 MB/sec      1.16     2.33     4.14     1.28     2.26     5.03
 ms/file     3.53     3.51     3.96     3.20     3.62     3.26    0.307

                End of test Mon Apr 13 16:18:45 2020
 
Variations

1000   111.56   108.91   108.29   110.60    92.45   108.48
1000   112.53   110.51   110.89   103.18   101.20   110.89
1000   111.65   111.42   109.67   109.77    99.56   100.98

 msecs      0.007    0.011    0.052     0.93     1.30     0.98
 msecs      0.006    0.011    0.127     1.05     0.83     0.83
 msecs      0.006    0.009    0.275     1.44     0.84     0.89

 ms/file     3.53     3.51     3.96     3.20     3.62     3.26    0.307
 ms/file     4.51     3.07     3.27     1.97     2.03     2.22    0.140
 ms/file     3.59     3.83     4.16     2.80     2.93     3.03    0.186
 
Performance Monitor

The following are results from the sar -n network performance monitor. This can be used following installation of the sysstat package. The command executed was sar -n DEV 1 10, for 10 1 second periods and average, entered after the start of the write and read speed displays. The tx and rx kB/second recordings are essentially the same as those produced by the benchmark. The main other measurements are for packets per second, with packet sizes around 1480 Bytes, return 66 Bytes.


 eth0   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s   %ifutil

 Write  4258.10  78338.00    283.48 115821.38      0.00      0.00      0.00     94.88
 Read  76744.60  33972.50 113341.35   2207.15      0.00      0.00      0.00     92.85
 
LanSpeed Long Cables Next or Go To Start


LanSpeed Benchmark - Normal Power, Long Cables

Cat 6

I have a 30 metre Cat 6 cable connected from the main hub, round the house, to another room, I extended this with two more cables to 48 metres. Examining the resultant log file, below, indicated that the only real change, from the short cable test, was on reading large files, more sample appearing to be slower. This is confirmed by the other two examples shown, and variations in the network performance results.

 #####################################################

  LanSpeed RasPi 1.0 Tue Apr 14 19:18:26 2020
 
 Selected File Path: 
 /media/public/
 Total MB  266240, Free MB  159280, Used MB  106960

                        MBytes/Second
  MB   Write1   Write2   Write3    Read1    Read2    Read3

1000   110.51   113.30   111.52   101.75    82.53    93.44
2000   114.09   113.78   113.21    91.33    86.31    89.50

 Random         Read                       Write
 From MB        4        8       16        4        8       16
 msecs      0.006    0.009    0.152     1.15     1.11     1.00

 200 Files      Write                      Read                  Delete
 File KB        4        8       16        4        8       16     secs
 MB/sec      1.24     2.34     4.42     1.55     3.34     5.22
 ms/file     3.31     3.51     3.70     2.65     2.45     3.14    0.164

                End of test Tue Apr 14 19:21:59 2020

1000   112.49   111.73   113.20    98.30    85.79    89.54
1000   110.25   113.55   111.59   102.73    94.26    97.00

 eth0      rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s   %ifutil

Av Write   2974.60  78172.50    201.73 115578.00      0.00      0.00      0.00     94.68
Av Read   60009.60  16616.70  88632.31   1080.54      0.00      0.00      0.00     72.61

Sanple Read Per Second Range
19:19:04  80461.00  36840.00 118840.38   2387.14      0.00      0.00      0.00     97.35
19:19:09  48503.00   3765.00  71638.97    250.32      0.00      0.00      0.00     58.69
 
Thin Cable

I replaced the extension 8 metre cable with a 10 metre thin cable (Cat 5?) and tests repeated. As shown below, this lead to maximun network speed of 100 Mbps. A test was also run just using this thin cable, where resuklts were virtually identical, including the odd rxmcst/s, or number of multicast packets received per second. I have no idea why.

  
 #####################################################

   LanSpeed RasPi 1.0 Tue Apr 14 20:07:48 2020
 
 Selected File Path: 
 /media/public/
 Total MB  266240, Free MB  159282, Used MB  106958

                        MBytes/Second
  MB   Write1   Write2   Write3    Read1    Read2    Read3

 100    11.55    11.51    11.50    11.26    11.68    11.64
 200    11.68    11.63    11.66    11.67    11.72    11.72

 Random         Read                       Write
 From MB        4        8       16        4        8       16
 msecs      0.023    0.903    0.592     1.26     1.20     1.21

 200 Files      Write                      Read                  Delete
 File KB        4        8       16        4        8       16     secs
 MB/sec      1.05     1.94     3.29     1.08     1.93     3.23
 ms/file     3.90     4.23     4.99     3.80     4.24     5.08    0.320

                End of test Tue Apr 14 20:10:55 2020

 eth0      rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s   %ifutil

 Write     3231.50   7966.60    209.27  11776.81      0.00      0.00      0.20     96.48
 Read      8045.70   3962.70  11889.11    258.28      0.00      0.00      0.00     97.40
 
Data Validation Long Cable Next or Go To Start


Data Validation Long Cable

The results reported here are from running burnindrive2 stress testing program. Burnindrive writes four files, using 164 blocks of 64 KB, repeated 16 times (164.0 MB), with each block containing a unique data pattern. The files are then read for MMM minutes, on a sort of random sequence, with data and file ID checked for correct values. Then each block (unique pattern) is read numerous times, over SSS seconds, again with checking for correct values. MMM and SSS are runtime parameters, along with the filepath. Further information, including data pattern hexadecimal values, can be found in my ResearchGate report Raspberry Pi 4B Stress Tests Including High Performance Linpack.pdf.

The remote system was mounted as for LanSpeed, again to a PC using Windows 7. The run time command is shown below, followed by results, over 21 minutes. The way that the program works does not provide high speed data transmission. In this case, around 53 MB/second writing and 30 MB/second reading.

Command - ./burnindrive2 Seconds 4 Minutes 10 FilePath /media/public Log 30

  ###############################################################

 Linux Storage Stress Test for ARM v2.0, Tue Apr 14 23:24:01 2020

 File size  164.00 MB x 4 files, minimum reading time 10.0 minutes

 File 1  164.00 MB written in    3.17 seconds 
 File 2  164.00 MB written in    3.15 seconds 
 File 3  164.00 MB written in    3.07 seconds 
 File 4  164.00 MB written in    2.96 seconds 

         Total   12.35 seconds, Elapsed   12.35 seconds

              Start Reading Tue Apr 14 23:24:14 2020

 Read passes     1 x 4 Files x  164.00 MB in     0.41 minutes
 Read passes     2 x 4 Files x  164.00 MB in     0.80 minutes
 Read passes     3 x 4 Files x  164.00 MB in     1.15 minutes
 Read passes     4 x 4 Files x  164.00 MB in     1.53 minutes
 Read passes     5 x 4 Files x  164.00 MB in     1.89 minutes
 Read passes     6 x 4 Files x  164.00 MB in     2.26 minutes
 Read passes     7 x 4 Files x  164.00 MB in     2.61 minutes
 Read passes     8 x 4 Files x  164.00 MB in     2.97 minutes
 Read passes     9 x 4 Files x  164.00 MB in     3.32 minutes
 Read passes    10 x 4 Files x  164.00 MB in     3.68 minutes
 Read passes    11 x 4 Files x  164.00 MB in     4.03 minutes
 Read passes    12 x 4 Files x  164.00 MB in     4.40 minutes
 Read passes    13 x 4 Files x  164.00 MB in     4.75 minutes
 Read passes    14 x 4 Files x  164.00 MB in     5.10 minutes
 Read passes    15 x 4 Files x  164.00 MB in     5.46 minutes
 Read passes    16 x 4 Files x  164.00 MB in     5.81 minutes
 Read passes    17 x 4 Files x  164.00 MB in     6.18 minutes
 Read passes    18 x 4 Files x  164.00 MB in     6.55 minutes
 Read passes    19 x 4 Files x  164.00 MB in     6.90 minutes
 Read passes    20 x 4 Files x  164.00 MB in     7.25 minutes
 Read passes    21 x 4 Files x  164.00 MB in     7.60 minutes
 Read passes    22 x 4 Files x  164.00 MB in     7.96 minutes
 Read passes    23 x 4 Files x  164.00 MB in     8.31 minutes
 Read passes    24 x 4 Files x  164.00 MB in     8.67 minutes
 Read passes    25 x 4 Files x  164.00 MB in     9.03 minutes
 Read passes    26 x 4 Files x  164.00 MB in     9.38 minutes
 Read passes    27 x 4 Files x  164.00 MB in     9.75 minutes
 Read passes    28 x 4 Files x  164.00 MB in    10.13 minutes

            Start Repeat Read Tue Apr 14 23:34:22 2020

 Passes in 4 second(s) for each of 164 blocks of 64KB:

   2080   1920   1920   2080   2000   1940   2000   2020   1980   2000   2120
   2160   1760   1960   1960   1940   2000   2000   1900   1880   1960   2100
   1880   1920   2100   2040   1840   1960   1960   2060   2060   1900   2100
   2080   2000   2080   2180   2020   2280   2240   2120   2160   2160   2000
   2100   1920   2040   2020   2060   2180   2080   2000   2200   2060   1960
   1980   2060   2040   1980   2080   1980   1820   1960   1820   2180   1840
   2100   2280   1820   2200   1940   2100   2220   2000   2000   1780   1800
   2100   1980   1860   2080   2080   1880   2000   1900   2060   1960   2100
   2040   2120   1880   1940   2160   2160   2000   2060   2140   2180   1880
   2140   2200   1980   2120   2140   1960   2020   2140   2060   2120   1920
   2060   2160   1960   2160   2220   1980   1940   1920   1980   2080   1980
   2040   2160   2140   1980   2120   2160   2180   2040   2080   2020   2020
   2060   2120   2020   2100   2160   2100   2060   2120   2060   2080   1980
   1920   2060   2080   2160   1960   2120   2160   2100   2160   2060   2200
   2220   2260   2160   2180   2240   2120   2000   2220   2060   2200

 335660 read passes of 64KB blocks in    10.99 minutes

  No errors found during reading tests

              End of test Tue Apr 14 23:45:21 2020
  
Data Validation Long Thin Cable Next or Go To Start


Data Validation Long Thin Cable

This Burnindrive test was run via the 50 metre cable combination, including the 10 metre thin one, using the same command provided on the previous page. The slow results, introduced by the thin cable, were again shown, but somewhat slower than before, due to the program overheads, at 9.7 MB/second writing and 8.8 For each of the reading sessions.

Following the logged program results is a summary of details provided from running Perfmon, performance monitor, on the Windows 7 based PC. Besides network traffic, the selected parameters included PC disk input and output. Network writing and reading speeds are indicates as somewhat faster than recorded by the program, but could include unrelated activity. Calculated packet sizes were around 1500 Bytes data transfer and 70 acknowledgement.

The Perfmon statistics included a number for packets under 12 headings covering Controller, Interface and Pseudo, Discarded and Errors, Outbound and Received. All were recorded as zero.

 ###############################################################

 Linux Storage Stress Test for ARM v2.0, Thu Apr 16 14:27:14 2020

 File size  164.00 MB x 4 files, minimum reading time 10.0 minutes

 File 1  164.00 MB written in   16.93 seconds 
 File 2  164.00 MB written in   16.99 seconds 
 File 3  164.00 MB written in   16.96 seconds 
 File 4  164.00 MB written in   17.08 seconds 

         Total   67.96 seconds, Elapsed   67.96 seconds

              Start Reading Thu Apr 16 14:28:22 2020

 Read passes     1 x 4 Files x  164.00 MB in     1.26 minutes
 Read passes     2 x 4 Files x  164.00 MB in     2.51 minutes
 Read passes     3 x 4 Files x  164.00 MB in     3.75 minutes
 Read passes     4 x 4 Files x  164.00 MB in     5.00 minutes
 Read passes     5 x 4 Files x  164.00 MB in     6.24 minutes
 Read passes     6 x 4 Files x  164.00 MB in     7.49 minutes
 Read passes     7 x 4 Files x  164.00 MB in     8.74 minutes
 Read passes     8 x 4 Files x  164.00 MB in     9.98 minutes
 Read passes     9 x 4 Files x  164.00 MB in    11.23 minutes

            Start Repeat Read Thu Apr 16 14:39:35 2020

 Passes in 4 second(s) for each of 164 blocks of 64KB:

    580    560    580    580    580    580    580    560    560    560    560
    580    580    580    580    580    580    580    560    580    580    580
    580    580    580    580    580    580    580    580    580    580    580
    580    580    580    560    580    580    580    560    580    560    560
    580    560    580    560    580    580    580    580    580    580    580
    580    580    580    580    580    580    580    580    580    580    580
    580    560    580    580    580    560    560    580    560    580    580
    560    580    580    580    580    580    580    560    580    580    560
    580    580    580    580    580    580    580    580    580    580    580
    580    580    580    600    580    580    560    580    580    580    580
    580    580    580    580    580    580    580    580    580    580    580
    580    580    580    580    580    580    560    560    580    580    580
    580    580    580    580    580    580    580    580    580    580    580
    580    580    580    580    580    580    580    580    580    580    580
    580    580    580    580    580    580    580    580    580    580

 94700 read passes of 64KB blocks in    11.16 minutes

  No errors found during reading tests

              End of test Thu Apr 16 14:50:45 2020


                       Windows 7 Summary Perfmon Logging 

         Bytes   Bytes   Packets  Packets  Output  Disk Rd    Disk   Disk Wr    Disk    %CPU
       rec/sec sent/sec rec/sec  sent/sec Q length Bytes/sec Rds/sec Bytes/sec wrts/sec Util

Write 10534034   214239     7055     3047        0     1948        0  8148232       13    10
Read1   244962  9622502     3368     6449        0  9219947      142   239715        4     8
Read2   240384  9703990     3391     6502        0  9277668      146    16760        4     8

  
LanSpeed PoE Power Next or Go To Start


LanSpeed Benchmark - PoE Power, Long Cables

The first results below are for a speed test using the 48 metres of long cables, with power supplied by the remote TP-LINK TL-PoE150S PoE Injector Adapter. Performance was essentially the same as that using the normal power supply, except writing large files appeared to be slower. Details of later tests are shown, identifying that the degraded performance was irregular. The sar network monitoring details were for the first test, also identifying slow writing.

#####################################################

   LanSpeed RasPi 1.0 Fri Apr 17 11:49:50 2020
 
                        MBytes/Second
  MB   Write1   Write2   Write3    Read1    Read2    Read3

1000    89.03    90.89    88.84   112.83   103.04   108.71
2000    89.43    88.61    88.33   104.78   100.79   105.57

 Random         Read                       Write
 From MB        4        8       16        4        8       16
 msecs      0.007    0.008    0.102     0.94     0.84     0.81

 200 Files      Write                      Read                  Delete
 File KB        4        8       16        4        8       16     secs
 MB/sec      1.08     2.40     4.99     1.51     4.41     6.14
 ms/file     3.81     3.41     3.28     2.71     1.86     2.67    0.296

                End of test Fri Apr 17 11:53:30 2020

Later
1000   112.50   110.38   113.18   112.83   111.74   112.62
1000   112.42   112.16   109.86   109.71    95.00   103.44

 eth0      rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s   %ifutil

 Write     4135.70  62161.70    273.68  91792.31      0.00      0.00      0.00     75.20
 Read     73410.80  32399.50 108454.45   2100.40      0.00      0.00      0.20     88.85

Thin Cable

The Power over Ethernet speed tests, including the thin cable, did not impress. The first one, using the 10 metre thin cable plus 40 meter thick cables, failed to read any long files. Then, the next run, combined with the 30 metre CAT 6 cable, produced unacceptable slow reading speeds. A third test, provided expected long file writing and reading performance, but was slower on most random and small file tests. Note that these problems were not noted during earlier PoE tests, using just the 10 metre thin cable.

 #####################################################

  MB   Write1   Write2   Write3    Read1    Read2    Read3

  100A  11.53    11.51    11.53
  100B. 11.52    11.51    11.52     3.40     4.32     3.45

  All 10m thin + thick - 100A 40m, B 30m, next 8m

   LanSpeed RasPi 1.0 Fri Apr 17 15:10:31 2020

                        MBytes/Second
  MB   Write1   Write2   Write3    Read1    Read2    Read3

 100    11.56    11.57    11.53    11.63    11.63    11.66
 200    11.68    11.65    11.67    11.65    11.69    11.66

 Random         Read                       Write
 From MB        4        8       16        4        8       16
 msecs      0.019    2.962    3.711     1.31     1.77     1.76

 200 Files      Write                      Read                  Delete
 File KB        4        8       16        4        8       16     secs
 MB/sec      0.73     1.91     3.23     1.23     1.06     2.41
 ms/file     5.61     4.28     5.08     3.34     7.71     6.81    0.731

                End of test Fri Apr 17 15:13:40 2020
  
PoE Data Validation Long Cable Next or Go To Start


PoE Data Validation Long Cable

This was slightly slower, on reading, than the run using normal power, reading four files less in 13.1 seconds, and more than 6500 blocks less in 11 minutes.

Windows Perfmon results are also provided, confirming that they were again slightly higher than program writing and reading speeds. Unlike using normal power, when Perfmon was used, constant values of Family Controller\Packets Received Discarded were reported over the whole period, for all long cable tests.

 ###############################################################

 Linux Storage Stress Test for ARM v2.0, Sun Apr 19 10:24:24 2020

 File size  164.00 MB x 4 files, minimum reading time 10.0 minutes

 File 1  164.00 MB written in    3.09 seconds 
 File 2  164.00 MB written in    3.17 seconds 
 File 3  164.00 MB written in    3.01 seconds 
 File 4  164.00 MB written in    3.00 seconds 

         Total   12.28 seconds, Elapsed   12.28 seconds

              Start Reading Sun Apr 19 10:24:36 2020

 Read passes     1 x 4 Files x  164.00 MB in     0.42 minutes
 Read passes     2 x 4 Files x  164.00 MB in     0.77 minutes
 Read passes     3 x 4 Files x  164.00 MB in     1.16 minutes
 Read passes     4 x 4 Files x  164.00 MB in     1.52 minutes
 Read passes     5 x 4 Files x  164.00 MB in     1.90 minutes
 Read passes     6 x 4 Files x  164.00 MB in     2.26 minutes
 Read passes     7 x 4 Files x  164.00 MB in     2.61 minutes
 Read passes     8 x 4 Files x  164.00 MB in     2.97 minutes
 Read passes     9 x 4 Files x  164.00 MB in     3.35 minutes
 Read passes    10 x 4 Files x  164.00 MB in     3.72 minutes
 Read passes    11 x 4 Files x  164.00 MB in     4.11 minutes
 Read passes    12 x 4 Files x  164.00 MB in     4.48 minutes
 Read passes    13 x 4 Files x  164.00 MB in     4.84 minutes
 Read passes    14 x 4 Files x  164.00 MB in     5.19 minutes
 Read passes    15 x 4 Files x  164.00 MB in     5.59 minutes
 Read passes    16 x 4 Files x  164.00 MB in     5.97 minutes
 Read passes    17 x 4 Files x  164.00 MB in     6.33 minutes
 Read passes    18 x 4 Files x  164.00 MB in     6.71 minutes
 Read passes    19 x 4 Files x  164.00 MB in     7.10 minutes
 Read passes    20 x 4 Files x  164.00 MB in     7.47 minutes
 Read passes    21 x 4 Files x  164.00 MB in     7.81 minutes
 Read passes    22 x 4 Files x  164.00 MB in     8.17 minutes
 Read passes    23 x 4 Files x  164.00 MB in     8.55 minutes
 Read passes    24 x 4 Files x  164.00 MB in     8.92 minutes
 Read passes    25 x 4 Files x  164.00 MB in     9.35 minutes
 Read passes    26 x 4 Files x  164.00 MB in     9.75 minutes
 Read passes    27 x 4 Files x  164.00 MB in    10.13 minutes

            Start Repeat Read Sun Apr 19 10:34:44 2020

 Passes in 4 second(s) for each of 164 blocks of 64KB:

   2100   2040   1760   1960   1900   1740   1980   2060   2080   2140   1880
   2040   1860   2100   2160   2060   2040   2020   2020   2000   1900   1840
   2020   2060   2120   1940   1800   2160   2140   2080   2140   2000   1860
   2160   1860   2020   2200   1860   2000   2000   1720   2300   2140   2120
   2020   2040   1980   2000   1880   2160   1880   2080   1980   1720   2140
   2200   1900   2280   2100   2100   2080   1800   1880   1780   2120   2140
   1800   2060   1620   2040   1920   2000   1860   1580   1900   2140   2140
   2060   1920   2120   2220   2160   1800   2000   1820   1780   2020   1940
   2240   2020   2080   2000   1840   2080   1980   1860   1820   1840   2100
   2020   1980   2100   1860   1860   1960   1960   1700   1940   1740   2120
   2020   2200   2180   2240   1840   2180   2080   2160   2200   2160   2160
   1780   2020   2100   1660   2060   1820   2020   1920   2100   2140   2140
   1960   2020   2300   1960   2020   2060   2160   1980   2080   2160   1900
   1900   2100   2140   2000   1980   2020   1980   2140   2160   1940   1920
   1960   2100   2040   2160   2180   1980   1940   2180   2020   1820

 329080 read passes of 64KB blocks in    11.00 minutes

  No errors found during reading tests

              End of test Sun Apr 19 10:45:44 2020

                       Windows 7 Summary Perfmon Logging 

         Bytes   Bytes   Packets  Packets  Output  Disk Rd    Disk   Disk Wr    Disk    %CPU
       rec/sec sent/sec rec/sec  sent/sec Q length Bytes/sec Rds/sec Bytes/sec wrts/sec Util
 
Write 54933931   301095   36790     3540         0         0       0  17889800       29   12
Read1   410183 32125907    5383    21526         0  30665779     473    112951        4   13
Read2   415707 34214684    5415    22924         0  32660559     508     30468        4   12
PoE Data Validation Including Thin Cable Next or Go To Start


PoE Data Validation Including Thin Cable

Again these tests failed to run properly with some long cable combinations, writing far too slowly at total lengths of 50 and 40 metres, as shown below. Reading was found to be happening, but pitifully slowly. A successful run was achieved at 18 metres. Then, as apparent from the running times and Windows Perfmon results, this was slightly slower than the 50 metre test, using normal power supplies.

 ###############################################################

 File size  164.00 MB x 4 files, minimum reading time 10.0 minutes

 40m + 10 m thin
 File 1  164.00 MB written in   51.04 seconds 
 File 2  164.00 MB written in   54.63 seconds 
 File 3  164.00 MB written in   54.96 seconds 
 File 4  164.00 MB written in   49.84 seconds 

 30m + 10 m thin
 File 1  164.00 MB written in   32.96 seconds 
 File 2  164.00 MB written in   34.74 seconds 
 File 3  164.00 MB written in   32.21 seconds 
 File 4  164.00 MB written in   32.59 seconds 

 ###############################################################

 8m + 10m thin

 Linux Storage Stress Test for ARM v2.0, Sun Apr 19 12:44:00 2020

 File 1  164.00 MB written in   16.96 seconds 
 File 2  164.00 MB written in   16.96 seconds 
 File 3  164.00 MB written in   16.91 seconds 
 File 4  164.00 MB written in   16.99 seconds 

         Total   67.82 seconds, Elapsed   67.82 seconds

              Start Reading Sun Apr 19 12:45:08 2020

 Read passes     1 x 4 Files x  164.00 MB in     1.29 minutes
 Read passes     2 x 4 Files x  164.00 MB in     2.55 minutes
 Read passes     3 x 4 Files x  164.00 MB in     3.81 minutes
 Read passes     4 x 4 Files x  164.00 MB in     5.06 minutes
 Read passes     5 x 4 Files x  164.00 MB in     6.32 minutes
 Read passes     6 x 4 Files x  164.00 MB in     7.58 minutes
 Read passes     7 x 4 Files x  164.00 MB in     8.84 minutes
 Read passes     8 x 4 Files x  164.00 MB in    10.10 minutes

            Start Repeat Read Sun Apr 19 12:55:14 2020

 Passes in 4 second(s) for each of 164 blocks of 64KB:

    580    560    580    580    560    520    560    580    580    580    580
    580    580    580    580    580    520    560    580    580    580    580
    580    580    580    580    520    580    580    580    580    580    580
    580    580    580    580    580    580    580    580    580    580    580
    580    580    580    580    580    520    580    580    580    580    580
    580    580    580    580    580    580    520    580    580    580    580
    580    580    580    580    580    580    580    580    540    580    580
    580    540    580    580    580    580    580    580    580    580    580
    580    560    560    560    580    560    520    580    580    580    520
    520    580    580    580    580    580    520    580    580    520    580
    540    520    580    580    580    580    580    580    580    580    580
    580    580    560    580    580    580    560    580    580    560    520
    580    580    580    580    580    520    580    580    580    580    580
    580    580    540    580    580    580    580    580    580    580    580
    560    580    560    580    560    540    580    580    540    580

 93820 read passes of 64KB blocks in    11.20 minutes

  No errors found during reading tests

              End of test Sun Apr 19 13:06:26 2020

                       Windows 7 Summary Perfmon Logging 

         Bytes   Bytes   Packets  Packets  Output  Disk Rd    Disk   Disk Wr    Disk    %CPU
       rec/sec sent/sec rec/sec  sent/sec Q length Bytes/sec Rds/sec Bytes/sec wrts/sec Util
 
Write 10449522   213390    6999      3038        0      1427       0   9848739       18    9
Read1   238376  9524994    3354      6382        0   9090131     140     36065        4    8
Read2   239729  9577087    3374      6417        0   9157249     145     16583        3    8
  
Floating Point Voltage Check Next or Go To Start


PoE Floating Point Voltage Check

For a check that PoE voltage appeared to be adequate, CPU stress tests, that had been identified as those with the highest current demands, were run. For floating point it was MP-FPUStress using 8 threads, 1280 KB, 32 Operations Per Word. The RPiHeatMHzVolts2 program was run at the same time to record CPU MHz, Voltage and temperatures. These particular tests were run with an operational HAT fan, for steady state conditions.

The tests were run with power supply provided as indicated below, those with 50 metre cables included the 10 metres thin cable. All ran continuously with the CPU at 1500 MHz. Different CPU voltages were indicated, but these were also consistent. The last results shown are from where the power is obtained via the Ethernet Active PoE Splitter, not the PoE HAT. Average and maximum recordings are shown at the end, effectively indicating the same performance and temperatures for all tests.

        Normal Power    PoE Thick 48m   PoE 50m mixed   PoE not HAT 50m

MHz         1500            1500            1500            1500
Volts     0.8472          0.8455          0.8490          0.8472

 Seconds  MFLOPS CPU PMIC MFLOPS CPU PMIC MFLOPS CPU PMIC MFLOPS CPU PMIC
                  C  C          C  C          C  C          C  C
   Start   20168  47  46   20123  49  47   20102  47  45   20254  49  47
      10   20168  57  55   20213  59  55   20102  58  55   20254  58  55
      20   20276  60  55   20216  61  57   20180  61  57   20258  61  57
      30   20556  61  57   20605  62  59   20307  61  57   20245  61  58
      40   20316  61  57   20181  61  59   20343  61  57   20556  61  58
      50   20212  60  57   20276  62  59   20579  61  58   20198  61  58
      60   20074  61  57   20190  62  59   20310  61  58   20291  62  58
      70   20210  60  57   20157  60  59   20228  61  58   20280  60  58
      80   20265  60  57   20616  62  59   20165  60  58   20212  60  58
      90   20573  60  57   20297  61  59   20179  61  58   20321  60  58
     100   20228  59  57   20342  62  59   20222  62  58   20543  60  58
     110   20285  60  57   20238  61  59   20580  62  58   20291  60  58
     120   20263  60  57   20240  61  59   20215  61  58   20234  60  58
     130   20235  60  57   20549  61  59   20247  60  58   20222  61  57
     140   20222  59  57   20272  62  59   20194  60  57   20216  61  58
     150   20289  59  56   20173  62  59   20356  60  57   20279  59  57
     160   20565  58  57   20114  61  58   20238  60  57   20191  61  58
     170   20214  59  57   20303  60  58   20287  61  57   20571  60  58
     180   20299  59  57   20581  62  59   20271  62  58   20339  60  58
     190   20203  59  56   20124  61  59   20215  61  58   20279  59  58
     200   20244  58  57   20218  60  59   20219  61  58   20295  59  57
     210   20084  58  55   20160  61  58   20354  61  58   20116  60  57
     220   20411  59  55   20484  61  59   20254  62  58   20351  60  56
     230   20463  59  55   20399  62  59   20238  62  58   20395  60  58
     240   20247  59  55   20249  61  59   20176  61  58   20555  60  57
     250   20321  59  55   20184  61  59   20612  61  58   20229  60  57
     260   20245  58  55   20270  62  59   19988  61  59   20140  60  58
     270   20289  59  55   20595  61  59   20336  61  58   20298  60  57
     280   20339  59  55   20285  61  58   20336  61  59   20118  59  57
     290   20280  58  55   20142  60  59   20291  62  58   20194  59  57
     300   20296  58  55   20251  61  59   20256  61  58   20620  60  57
     310   20324  58  55   20298  62  59   20543  61  58   20079  60  57
     320   20311  58  55   20273  60  59   20349  62  58   20270  60  57
     330   20256  59  55   20126  61  59   20310  61  58   20146  59  58
     340   20320  59  55   20078  61  59   20117  60  58   20185  60  58
     350   20250  58  55   20264  61  59   20077  61  58   20172  60  57
     360   20570  58  55   20252  61  59   20233  60  57   20085  59  57
     370   20299  59  55   20598  61  59   20334  61  57   20549  59  58
     380   20153  59  55   20326  61  59   20297  61  58   20391  59  58
     390   20214  58  55   20125  61  59   20626  61  58   20196  60  57
     400   20288  59  55   20276  61  59   20214  60  58   20157  60  57
     410   20273  58  55   20564  61  59   20234  60  58   20270  60  57
     420   20544  58  55   20174  62  59   20290  61  58   20269  60  58
     430   20268  58  55   20243  61  59   20320  61  58   20319  59  57
     440   20225  59  55   20178  61  57   20211  61  57   20559  60  58
     450   20223  58  55   20233  61  59   20634  61  58   20262  60  58
     460   20304  59  55   20587  61  59   20292  61  57   20219  60  58
     470   20266  58  55   20165  61  59   20303  61  58   20222  60  58
     480   20220  58  55   20297  61  59   20197  61  58   20275  59  58
     490   20591  57  55   20191  61  58   20104  61  59   20319  60  58
     500   20222  57  55   20173  61  58   20244  60  58   20575  60  58
     510   20216  57  55   20618  60  59   20573  60  58   20248  60  58
     520   20207  58  55   20167  61  59   20209  60  58   20136  59  58
     530   20225  58  55   20247  61  59   20184  61  57   20238  60  58
     540   20149  58  55   20230  61  59   20320  59  57   20289  60  58
     550   20460  58  55   20477  62  59   20227  60  57   20325  60  57
     560   20236  58  55   20362  60  59   20215  61  58   20212  59  57
     570   20236  59  55   20166  61  59   20238  61  58   20556  60  58
     580   20117  58  55   20089  61  59   20348  62  58   20243  60  58
     590   20118  58  55   20092  60  59   20228  61  58   20310  59  57
     600   20312  58  55   20611  61  59   20177  60  59   20112  59  57

 Average   20283  58  56   20287  61  59   20279  61  58   20287  60  57
 Maximum   20591  61  57   20618  62  59   20634  62  59   20620  62  58
Integer Test Voltage Check Next or Go To Start


PoE Integer Test Voltage Check

The integer stress test used was MP-IntStress, again with 8 threads, 1280 KB and power supply arrangements. CPU MHz and voltages were also the same as above. Temperatures were not as high as during the floating point tests.

Performance was little different, over all the runs. Temperatures were also the same, except the last test, where there were indications that the PoE HAT voltage conversion might lead to an increase.


        Normal Power    PoE Thick 48m   PoE 50m mixed   PoE not HAT 50m

MHz         1500            1500            1500            1500
Volts     0.8455          0.8455          0.8490          0.8472

 Seconds  MB/sec CPU PMIC MB/sec CPU PMIC MB/sec CPU PMIC MB/sec CPU PMIC
                  C  C          C  C          C  C          C  C
  Start    22231  48  46   21580  46  44   21840  46  45   22291  42  39
      10   22201  55  51   21052  55  51   21659  54  51   22172  50  46
      20   22089  56  51   21223  55  51   21466  54  51   22238  52  46
      30   21580  56  51   21392  56  51   21567  54  51   21688  52  48
      40   21093  55  51   22002  56  52   21433  54  51   22032  53  48
      50   20678  56  52   21213  55  51   21253  55  51   22256  54  50
      60   20990  56  52   21440  56  52   21345  55  51   22180  53  50
      70   20372  56  52   20951  56  51   21719  55  52   22223  54  49
      80   20708  56  52   21630  56  53   21525  56  52   22184  54  49
      90   21311  56  52   21722  56  53   22230  55  53   22158  53  49
     100   21075  56  52   21005  56  53   22233  55  52   22265  52  49
     110   22049  57  52   20092  57  53   22011  57  53   22299  54  49
     120   22012  56  52   21580  56  53   21495  57  52   22238  53  49
     130   21663  56  52   21639  56  53   20992  55  52   22124  54  50
     140   22161  56  52   21756  56  53   21149  56  53   22266  53  49
     150   21469  56  52   20782  56  53   21538  55  52   22235  53  49
     160   21122  56  52   21128  56  53   21992  57  53   22242  54  49
     170   21865  55  51   21276  56  53   21764  56  53   22241  52  49
     180   22135  56  51   20859  56  53   21543  56  53   20933  53  49
     190   21366  55  51   20812  56  53   21131  56  52   20918  53  49
     200   22267  55  51   22068  56  53   21433  56  52   20322  53  49
     210   21514  56  52   21147  55  52   22185  56  52   21007  54  49
     220   22156  55  51   21052  56  52   21751  55  53   21043  52  49
     230   21583  55  51   20699  55  52   22256  57  52   20905  53  48
     240   21204  56  51   19376  55  52   22338  56  52   21346  53  48
     250   20525  56  51   21277  56  52   22268  56  52   21463  51  47
     260   21098  54  51   21437  55  52   21460  56  52   22236  51  47
     270   21218  54  50   20804  56  52   21759  56  52   22049  51  47
     280   21418  54  50   21507  56  52   21830  57  53   22231  52  48
     290   22362  54  51   21875  55  52   22349  56  53   22277  53  48
     300   22218  54  51   21099  57  53   22390  56  53   22298  53  48
     310   22224  54  51   20999  56  52   22415  55  52   22296  52  49
     320   22266  55  51   21265  55  52   22024  57  53   22236  52  49
     330   21657  56  51   21269  56  52   21657  56  52   20896  53  49
     340   21941  55  51   21169  54  51   21313  57  53   21131  52  49
     350   22015  55  52   20568  54  51   21578  57  53   20844  53  49
     360   21029  56  52   21208  54  51   21592  56  52   21067  54  49
     370   21154  55  51   21473  54  51   22199  56  53   20914  53  49
     380   20550  55  52   21379  54  51   22335  56  53   21044  53  50
     390   21051  55  52   20510  54  51   21289  55  52   20963  53  49
     400   20925  55  52   20684  54  51   21662  56  51   20588  53  49
     410   20097  56  52   21536  55  51   21790  55  51   20626  54  49
     420   21885  54  52   21516  56  52   21630  54  51   22252  53  49
     430   21645  56  52   21621  56  52   22345  54  51   22174  54  48
     440   22238  56  52   21690  56  52   21987  54  51   22285  53  49
     450   22058  55  52   21765  55  52   22390  54  51   22239  53  50
     460   21830  55  52   21437  56  52   22374  54  51   22189  53  50
     470   22183  56  52   22045  56  52   21409  54  51   21749  53  49
     480   22242  56  51   20792  57  52   21063  55  51   21644  53  50
     490   21881  56  52   20685  57  52   21405  54  51   21276  52  48
     500   22377  55  52   21607  56  52   21724  55  51   21048  52  47
     510   22270  57  52   20840  55  52   21704  54  52   20846  52  48
     520   21065  54  51   20626  56  52   21967  56  52   20792  51  47
     530   21099  54  50   20614  55  52   21210  57  52   20916  53  48
     540   20931  54  51   21488  56  52   21832  56  52   21043  53  49
     550   21271  54  51   20826  56  52   22413  56  52   20873  53  49
     560   21321  55  51   19965  56  52   21199  56  52   22275  52  50
     570   21206  55  51   21075  56  52   22195  56  52   22245  53  49
     580   20819  55  51   20834  56  52   22342  56  52   22096  53  49
     590   22059  54  51   21931  55  52   22093  56  52   22280  52  50
     600   21598  55  51   21477  57  52   22344  55  52   22136  53  49

 Average   21551  55  52   21186  55  52   21793  55  52   21694  53  48
 Maximum   22377  57  52   22068  57  53   22415  57  53   22299  54  50
  
PoE Stress Tests With USB Drives Next or Go To Start


PoE Stress Tests With USB 3 Hard Drive and USB 3 Flash Drive

It became clear on running these tests, that careful consideration of USB connection and activity might be needed with PoE. Using the 50 metre cable combination, with the thin one, caused crashes of stress testing program, without any USB activity, and also with the long thick cable, when attempting to use the hard drive.

Following are details of successful tests, using normal power and PoE with the USB drives connected, then normal power plus a hard drive benchmark and PoE whilst benchmarking the USB 3 flash drive. There was not a lot of difference in the results, including with the impact of USB data transfers transfers (indicated as #), in both cases averaging more than 100 MB/second for much of the time, with 500 and 1000 MB files.

          Normal Power    Normal Power +HD    PoE 48m        PoE 48m +USB 3 Sick

 MHz        1500            1500                1500            1500
 Volts    0.8490          0.8490              0.8490          0.8490

 Seconds  MFLOPS CPU PMIC MFLOPS CPU PMIC HD  MFLOPS CPU PMIC MFLOPS CPU PMIC FD
                  C  C          C  C              C  C          C  C
   Start   20442  47  45   19968  46  45       19992  50  47   20154  47  47
      10   20335  58  55   20283  57  54       20260  60  56   20279  57  55
      20   20425  60  57   20112  60  56       20341  62  58   20346  61  57
      30   20564  61  55   20542  62  57       20121  65  61   20151  64  59  #
      40   20401  61  59   19310  61  58  #    20122  64  61   17594  64  59  #
      50   20311  62  59   19105  61  58  #    20242  65  61   17387  63  59  #
      60   20376  62  59   18475  61  58  #    20063  65  61   17330  64  61  #
      70   20451  62  59   18859  63  58  #    18663  64  59   17735  64  61  #
      80   20270  62  59   18989  61  59  #    20178  63  61   16920  64  61  #
      90   20346  62  59   18882  61  58  #    20229  63  61   16996  64  61  #
     100   20649  63  59   19095  62  58  #    20193  63  61   17036  63  59  #
     110   20351  63  59   18663  61  58  #    14925  62  58   17150  64  59  #
     120   20365  62  59   18515  61  58  #    19801  62  59   16785  64  61  #
     130   20285  62  59   19395  60  58  #    20183  63  60   17525  64  61  #
     140   20337  62  59   19934  62  59  #    20334  63  59   17489  64  61  #
     150   20295  61  59   20250  61  58  #    19297  63  61   18130  64  61  #
     160   20410  61  59   20442  62  59       20148  64  61   20253  65  62  #
     170   20546  62  59   20467  61  59       20151  64  61   19864  64  62  #
     180   20345  60  59   20162  61  59       20174  64  61   19843  65  62  #
     190   20307  61  59   20171  63  59       20239  64  61   19936  65  63  #
     200   20325  62  59   20081  62  59       20113  64  61   19971  66  63  #
     210   20221  63  59   19024  63  59  #    20277  64  62   20009  66  63  #
     220   20388  62  59   18710  62  59  #    20431  63  62   19758  65  63  #
     230   20601  61  59   18622  62  59  #    20186  63  62   19881  66  63  #
     240   20344  62  59   19118  61  58  #    20106  64  62   20402  65  63
     250   20415  62  59   18755  61  59  #    20558  63  62   20229  66  63
     260   20346  62  59   18576  61  59  #    20102  64  61   20335  66  63
     270   20332  62  59   18533  63  59  #    19574  64  62   20333  66  63
     280   20317  62  59   17994  62  59  #    19983  65  62   20343  66  63
     290   20526  60  59   18237  62  59  #    19715  65  62   20230  66  63
     300   20467  62  59   19920  61  59  #    20006  65  62   20223  66  63
     310   20390  62  59   20280  63  59       19849  65  62   20536  66  63
     320   20321  61  59   20222  62  59       19904  65  62   20387  66  63
     330   20430  61  59   20255  61  59       20018  65  62   20286  66  63
     340   20406  62  59   20091  61  59       19669  65  62   20265  65  63
     350   20273  62  59   20596  61  59       20060  64  62   20306  65  63
     360   20464  62  59   20282  61  59       20078  64  62   20292  65  63
     370   20546  62  59   20264  61  59       20042  64  62   20169  66  63
     380   20457  61  59   20102  62  59       19940  65  62   20198  65  63
     390   20280  61  59   20147  62  59       19972  65  62   19930  65  63
     400   20371  62  59   20640  61  59       20037  65  62   19219  65  63
     410   19258  62  59   20187  61  59       20055  64  62   20027  65  63
     420   19449  62  59   20153  62  59       20067  64  62   20023  65  63
     430   20234  61  57   20224  61  59       19997  64  62   20203  66  63
     440   20334  62  59   20250  60  59       20131  64  62   19635  66  63
     450   20007  62  59   20298  62  59       20338  64  62   20225  66  63
     460   20189  62  59   20214  62  59       19861  65  62   20337  66  63
     470   20296  62  59   20115  62  59       19811  65  62   20554  66  63
     480   20242  61  59   20295  61  59       20178  64  62   20331  66  63
     490   20174  62  59   20298  62  59       20210  66  62   20232  66  63
     500   20227  61  59   20454  62  58       20221  64  62   20311  66  63
     510   20586  62  59   20206  62  59       20230  65  62   20101  66  63
     520   20341  62  59   20240  62  59       20576  65  62   20236  66  63
     530   20276  63  59   20268  61  59       20130  64  62   20299  65  63
     540   20191  62  59   20637  61  59       20162  65  62   20651  65  63
     550   20298  61  59   20156  61  59       20225  65  62   20327  65  63
     560   20224  63  59   20244  62  59       20223  65  62   20247  66  63
     570   20485  61  59   20273  61  59       19534  64  62   20210  66  63
     580   20415  62  59   20196  62  59       19891  64  63   20336  66  63
     590   20223  62  59   20420  61  59       19249  64  62   20214  67  63
     600   20198  61  59   20479  61  59       20248  64  62   20443  66  63

 Average   20323  61  59   19798  61  58       19961  64  61   19625  65  62
 Maximum   20649  63  59   20640  63  59       20576  66  63   20651  67  63
  
PoE PuTTy Remote Control Windows 7 Next or Go To Start


Terminal Remote Control - One Wire PoE WiFi Only - Windows 7 and PuTTy

These tests were carried out with only the Ethernet 48 metre cable combination connected to a Raspberry Pi 4 with a PoE HAT, but without the cable being plugged in to the main hub. These were from a PC using Windows 7 with WiFi communication as the only available Pi connection. The first was from opening the Pi network folder on the PC and clicking on LanSpdx86Win.exe, saved on the Pi. The second one was after entering the Pis IP address in the PuTTy application and running the Pi LanSpeed benchmark using the fully functional Terminal.

Windows Benchmark From Raspberry Pi 4 - On opening Widow Network access to my remote Raspberry Pi, and clicking on LanSpdx86Win.exe, a Command Prompt window appears on the PC. The benchmark then runs, displaying results as they are calculated. Following are details obtained via Print Screen.

Note that performance can vary in all test functions, across the different platforms used. Connecting to my main hub, 5 GHz WiFi from a smartphone was indicated as running at 131 Mbps, with another, at 2.4 GHz, achieving 72 Mbps. These would be around 14.4 and 8.0 MBytes/second, respectively. Here, WiFi measured speeds of large files are all less than 10 MB/second.



Win7wifi


Raspberry Pi Benchmark From PuTTy on Windows 7 - The next measurements are from using PuTTy, on a Windows 7 based PC, that requires the Pis IP address to be entered. This provides a Linux Terminal with all the usual copying and earlier commands to be used again. In this case, commands selected were cd to the appropriate folder, mounting the PC destination folder and execution of the program. Again, Print Screen was used to produce the following details.

Note, performance of this benchmark, running on the Pi, is somewhat slower than than from the Windows program, on all test functions.

Win7wifi


  
PoE Terminal Remote Control Windows 10 Next or Go To Start


Terminal Remote Control - One Wire PoE Windows 10 & Phone

In order to carry out these tests, the longer cable combination could not be used, power being supplied via an 8 metre CAT 6 Ethernet cable, again with no data connection, to force the use of WiFi. In order to execute the benchmark on the Pi, Windows PoweShell had to be used, along with an ssh command (ssh pi@192.168.1.????). Then the usual set up and run commands could then be selected to produce the following results, copied using Print Screen, again.

Bearing in mind that is the same benchmark program run on the Pi, from Windows 7, performance writing and reading large files was faster, but other test functions essentially the same.

Win10wifi

Phone Screen Shot - An Android phone was used for monitoring purposes, after installing the Termius app. Setup for this requires the same ssh details indicated above. In this case, the sar -n DEV network monitoring tool was used to confirm WiFi transmission speeds. Below is a copy of a screenshot from the phone, for one sample covering twelve seconds. Details from The LanSpeed log follow, starting four seconds before sar. During this period, a total of around 8 MB/second was recorded by sar, essentially the same as that shown in the benchmark log.

Win10wifi

                            LanSpeed RasPi 1.0 Sun Apr 26 20:19:36 2020

                                             MBytes/Second
                     MB   Write1   Write2   Write3    Read1    Read2    Read3

                      8     8.06     7.81     8.17     8.35     8.09     7.39
                     16     7.10     8.12     8.51     7.85     7.42     7.59
  
Non-HAT PoE Terminal Remote Control Linux Next or Go To Start


Terminal Remote Control - One Wire PoE No HAT or Fan, Linux

These tests again included power over the 8 metres cable, but this was supplied to the Pi from the Ethernet Active PoE Splitter, through the normal Pi board supply socket. No cooling fan was connected. This time, the client system was a PC running Linux Abuntu, connecting via two Terminals using an ssh pi@192.168.1.???? command. One terminal was used to run and display the Floating Point stress test, using one then 8 threads, the other terminal running the program that measures CPU MHz, volts and temperatures. Below are copies or extractions obtained using Print Screen.

Using a single thread, CPU MHz and recorded MFLOPS were effectively constant over the 10 minutes run, with only moderate increases in temperature. The 8 thread test lead to temperature increases that gave rise to CPU MHz throttling, with corresponding reductions in measured MFLOPS. These tests suggest that fanless one wire working could be possible, to provide constant performance, with light the CPU loading.

UbuntuWiFi

UbuntuWiFi

Terminal Remote Control To Pi64 Next or Go To Start


Terminal Remote Control One Wire PoE to Pi64 From Pi32

This demonstrates, using ssh from a Raspberry Pi using Raspbian (pi@raspberrypi), to connect to a different Pi with 64 bit Gentoo (demouser@pi64), running a 64 bit program there and displaying the results locally./

pi64a

pi64b





PoE VNC Viewer Windows Next or Go To Start

VNC Viewer One Wire PoE Windows From Pi

VNC Viewer was installed on a Windows based PC to display a remote desktop that would have been produced on a Raspberry Pi. Initially, the desktop was not displayed under Windows. As reported, when no display is connected, a change is needed in raspi-config, Advanced Options, Resolution, where one has to be selected from the list, instead of the Default setting. VNC Viewer and Server were installed on the Raspberry Pi. The resolution chosen was deliberately smaller than possible, to allow more visible activities on the Windows screen.

To Start the activity, logging on is via VNC Connect, in the bottom left hand corner below. This then displays the remote desktop window. In this case, a Terminal was opened (bottom right), where normal Linux curser operations retrieved paths and execution statements. The latter were arranged to execute my OpenGL benchmark, rotating kitchen test function and run it for a while. When running, time and performance details are displayed in the test window title bar and on the Terminal. A clearer copy of part of the Terminal results is shown below. The main display screenshot was captured using PrtScr.



ogl1

ogl2




PoE VNC Viewer Other Pi Next or Go To Start

VNC Viewer One Wire PoE Pi From Other Pi

The VNC applications were installed on a second Raspberry Pi, to check that remote desktop could be accessed. In this case, I ran one of my benchmarks that measures floating point performance, using an increasing number of threads. The local and enclosed remote Raspberry Pi desktops are show below and a clearer view of the Terminal contents below.


ogl1

ogl2




VNC Viewer Android Mobile Phone Next or Go To Start

Android Mobile Phone VNC Viewer

This exercise did not involve PoE but was used to demonstrate the use of VNC Viewer on an Android phone. Following are sections of screenshots showing the installed app icon, VNC Connection facility and a display of my JavaDraw benchmark, running on the Raspberry Pi (well part of it). In this case, it was more of a spying activity, as the benchmark was started on the Pi. This must raise data protection issues.

Below is a copy of the JavaDraw log file saved on the Raspberry Pi.





 
  Java Drawing Benchmark, May 1 2020, 13:42:12     
            Produced by javac 1.7.0_02              

  Test                              Frames      FPS 

  Display PNG Bitmap Twice Pass 1      638    63.76 
  Display PNG Bitmap Twice Pass 2      847    84.67 
  Plus 2 SweepGradient Circles         826    82.58 
  Plus 200 Random Small Circles        549    54.86 
  Plus 320 Long Lines                  234    23.34 
  Plus 4000 Random Small Circles        63     6.28 

         Total Elapsed Time  60.1 seconds           

  Operating System    Linux, Arch. arm, Version 4.19
  Java Vendor         Raspbian, Version  11.0.5     
 
Roy Longbottom May 2020

1960 to 2020 - Celebrating 60 years involvement in
computer reliability, performance and stress testing

Go To Start