Iperf 2 / Discussion / General Discussion: [BUG Report] -P Failed on Windows

chen qiang - 2021-02-22

environment: windows10
server: iperf>iperf-2.1.1.exe -s -u -i 1
client: iperf>iperf-2.1.1.exe -u -c 127.0.0.1 -P 2 -i 1

In windows 10 system,
Only one thread can be received at the same time
The other threads will received after the end of the first thread

I tried to add print to the code, and I find In func(Listener::udp_accept),
recvfrom will block when the first thread is working.

only the first thread stoped, recvfrom will get back，then start new thread 2.

iperf_bug_report_01.png

iperf_bug_report_02.png

iperf_bug_report_03.png

iperf_bug_report_04.png

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- Robert McMahon - 2021-02-22
  
  thanks, I'm able to reproduce this. Let me debug what's going on
  
  Bob
  
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  - Robert McMahon - 2021-02-25
    
    I filed ticket #99 for this
    
    Bob
    
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    - chen qiang - 2021-02-26
      
      Thank you for your efforts. It looks very troublesome. Will this be repaired in the future
      
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    - chen qiang - 2021-02-26
      
      Thank you for your efforts. It looks very troublesome. Will this be repaired in the future
      
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      - Robert McMahon - 2021-02-26
        
        I'm looking at an incr-port option as a work-around. I'll post once I have some code done.
        
        Bob
        
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      - Robert McMahon - 2021-02-26
        
        My plan is to support a port range on the server and and on the client. It would be something like:
        
        iperf -s -u -p 6000-6015
        
        iperf -c host -u -p 6000 -6015
        
        Bob
        
        Last edit: Robert McMahon 2021-03-01
        
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Robert McMahon - 2021-02-28

Can you try with the version dated Feb 27? The work around is to use the new port range feature. On the server and client use:

iperf -s -u -i 1 -p 6000-6007

iperf -c host -u -i 1 -p 6000-6007

Last edit: Robert McMahon 2021-02-28
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- chen qiang - 2021-03-01
  
  I tried it according to your example, and it worked. Thank you very much
  
  iperf_report.png
  
  iperf_run.png
  
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RafaS - 2021-05-07

Maybe that can be a hint to fix it: 2.0.5 still works with multiple UDP streams, apparently compiled with "win32 threads":
https://sourceforge.net/p/iperf/patches/21/
tested on win10:

iperf-2.0.14a-win.exe -c host -u -i1 -p5000 -t3 -b 200M -P2
iperf_2.0.5_threads.exe -s -u -i1 -p 5000
[ 1] 2.0- 3.0 sec 25.1 MBytes 210 Mbits/sec 0.000 ms 3/17894 (0.017%)
[ 3] 2.0- 3.0 sec 25.1 MBytes 210 Mbits/sec 0.000 ms 2/17899 (0.011%)
[SUM] 2.0- 3.0 sec 50.2 MBytes 421 Mbits/sec
iperf_2.0.5_threads.exe --version
iperf version 2.0.5 (08 Jul 2010) win32 threads

I also compared to 2.0.5 compiled with "pthreads" available here:
https://iperf.fr/iperf-download.php
iperf version 2.0.5 (08 Jul 2010) pthreads
and that version sees only one stream

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- Robert McMahon - 2021-05-10
  
  Thanks for this. I'll take a look.
  
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[BUG Report] -P Failed on Windows

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[BUG Report] -P Failed on Windows

[BUG Report] -P Failed on Windows

A means to measure network responsiveness and throughput

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[BUG Report] -P Failed on Windows