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iperf3: A TCP, UDP, and SCTP network bandwidth measurement tool
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[iperf3.17] After running UDP at 1000M, the throughput will drop to 0M in 30 mins #1759

Open Anthony6166 opened 1 month ago

Anthony6166 commented 1 month ago

I testing the 1G speed. After running UDP at 1000M, the throughput will drop to 0M in 30 mins. The command is repeted by a script. I tried to change the read/write buffer size to 10K (-l 10K). It still fails. Could you help provide some suggections?

Command: Server side: iperf3 -s Client side: iperf3 -u -c 192.168.181.10 --cport 27000 -n 50M -b 1000M -l 5K

Client side information:

-----------------------------------------------------------
Accepted connection from 192.168.181.11, port 49779
[  5] local 192.168.181.10 port 5201 connected to 192.168.181.11 port 27000
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-0.48   sec  5.21 MBytes  91.3 Mbits/sec  0.111 ms  105/1173 (9%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-0.48   sec  5.21 MBytes  91.3 Mbits/sec  0.111 ms  105/1173 (9%)  receiver
-----------------------------------------------------------
Server listening on 5201 (test #107)
-----------------------------------------------------------
Accepted connection from 192.168.181.11, port 49780
[  5] local 192.168.181.10 port 5201 connected to 192.168.181.11 port 27000
[ ID] Interval           Transfer     Bitrate         Total Datagrams
[  5]   0.00-1.01   sec   114 MBytes   948 Mbits/sec  23308
[  5]   1.01-1.01   sec   400 KBytes   988 Mbits/sec  80
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-1.01   sec   114 MBytes   948 Mbits/sec  0.000 ms  0/23387 (0%)  sender
-----------------------------------------------------------
Server listening on 5201 (test #108)
-----------------------------------------------------------
Accepted connection from 192.168.181.11, port 49781
[  5] local 192.168.181.10 port 5201 connected to 192.168.181.11 port 27000
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-0.48   sec  50.7 MBytes   877 Mbits/sec  0.014 ms  67/10442 (0.64%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-0.48   sec  50.7 MBytes   877 Mbits/sec  0.014 ms  67/10442 (0.64%)  receiver
-----------------------------------------------------------
Server listening on 5201 (test #109)
-----------------------------------------------------------
Accepted connection from 192.168.181.11, port 49782
[  5] local 192.168.181.10 port 5201 connected to 192.168.181.11 port 27000
[ ID] Interval           Transfer     Bitrate         Total Datagrams
[  5]   0.00-1.01   sec   114 MBytes   946 Mbits/sec  23303
[  5]   1.01-2.01   sec   106 MBytes   894 Mbits/sec  21785
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-2.01   sec   220 MBytes   920 Mbits/sec  0.000 ms  0/45087 (0%)  sender
-----------------------------------------------------------
Server listening on 5201 (test #110)
-----------------------------------------------------------
Accepted connection from 192.168.181.11, port 49783
[  5] local 192.168.181.10 port 5201 connected to 192.168.181.11 port 27000
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-1.01   sec  50.1 MBytes   415 Mbits/sec  0.004 ms  199/10462 (1.9%)
[  5]   1.01-2.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   2.01-3.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   3.01-4.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   4.01-5.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   5.01-6.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   6.01-7.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   7.01-8.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   8.01-9.01   sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]   9.01-10.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  10.01-11.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  11.01-12.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  12.01-13.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  13.01-14.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  14.01-15.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  15.01-16.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  16.01-17.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  17.01-18.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  18.01-19.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  19.01-20.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  20.01-21.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  21.01-22.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  22.01-23.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  23.01-24.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  24.01-25.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  25.01-26.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  26.01-27.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  27.01-28.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  28.01-29.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  29.01-30.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  30.01-31.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  31.01-32.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  32.01-33.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  33.01-34.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  34.01-35.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  35.01-36.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  36.01-37.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  37.01-38.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  38.00-39.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  39.00-40.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  40.00-41.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  41.00-42.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  42.00-43.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  43.00-44.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  44.00-45.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  45.00-46.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  46.00-47.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  47.00-48.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  48.00-49.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  49.00-50.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  50.00-51.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  51.00-52.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  52.00-53.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  53.00-54.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  54.00-55.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  55.00-56.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  56.00-57.00  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  57.00-58.02  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  58.02-59.02  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  59.02-60.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  60.01-61.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  61.01-62.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  62.01-63.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  63.01-64.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  64.01-65.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  65.01-66.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  66.01-67.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  67.01-68.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  68.01-69.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  69.01-70.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  70.01-71.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  71.01-72.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  72.01-73.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  73.01-74.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  74.01-75.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  75.01-76.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  76.01-77.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  77.01-78.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  78.01-79.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  79.01-80.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  80.01-81.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  81.01-82.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  82.01-83.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
[  5]  83.01-84.01  sec  0.00 Bytes  0.00 bits/sec  0.004 ms  0/0 (0%)
davidBar-On commented 1 month ago

No data is sent, because the 50MB (the -n option) are transmitted during the first interval. The problem is the test should have ended at this point and not continue forever.

What iperf3 version you are using (ipref3 -v)? It seems like an issue that was fixed in version 3.10 by PR #1114.

Anthony6166 commented 1 month ago

The version is the latest version 3.16. Another strange thing is that it seems that this problem only occurs in windows(windows 10 IoT LTSC), and there is no problem under Ubuntu: 22.04.

davidBar-On commented 1 month ago

Are you able to build iperf3? If you can, please use the code of PR #1764 (latest iperf3 code with a change to timeout when a control message is not received from the client).

Using this code, build and run the server using --debug=3 and --rcv-timeout 5000. The debug messages should show the server's states changes that may help to understand the problem.