iperf3: error |
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Problem
I am having an issue with iperf3, where at the end of a timed test session, the connection between the iperf3 server and client does not close correctly. The test bed looks like this: Command Server (128.0.0.2) - Connected to a dumb switch. This is used to issue commands to the clients Switch Client (128.0.1.9) - A Raspberry Pi with the latest version of iperf3. One interface is connected to the dumb switch, the other is connected to a gateway Gateway (192.168.0.1) - Gateway for traffic to and from the server Server (10.123.126.2) - A Debian machine running an iperf3 server Expected behaviourThe iperf3 client should open a session with the iperf3 server, report some data to stdout every ith second, close the session, and report some more data What is Actually HappeningThe iperf3 client opens a session with the iperf3 server, reports some data to standard out every ith second up until the last few seconds of the run, then hangs for about 15 minutes before reporting this message: iperf3: error - unable to receive control message: Connection timed outThis bug occurs whenever the run lasts for more than 10 minutes or so (i.e., whenever the -t >= 600). Recreating the bug command@server ~ $ /usr/bin/ssh -t -t [email protected] "/bin/bash -O huponexit -c '/usr/local/bin/iperf3 -c 10.123.126.2 -p 1309 -b 1M -t 3600 -i 60'" Output: Logging STDOUT and STDERR beginning on Fri Oct 30 11:26:27 2015 Connecting to host 10.123.126.2, port 1309 [ 4] local 192.168.0.11 port 51042 connected to 10.123.126.2 port 1309 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-60.00 sec 7.16 MBytes 1.00 Mbits/sec 0 29.7 KBytes [ 4] 60.00-120.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 120.00-180.00 sec 7.19 MBytes 1.01 Mbits/sec 0 29.7 KBytes [ 4] 180.00-240.00 sec 7.13 MBytes 997 Kbits/sec 0 26.9 KBytes [ 4] 240.00-300.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 300.00-360.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 360.00-420.00 sec 7.13 MBytes 997 Kbits/sec 0 32.5 KBytes [ 4] 420.00-480.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 480.00-540.00 sec 7.19 MBytes 1.01 Mbits/sec 0 32.5 KBytes [ 4] 540.00-600.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 600.00-660.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 660.00-720.00 sec 7.19 MBytes 1.01 Mbits/sec 0 32.5 KBytes [ 4] 720.00-780.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 780.00-840.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 840.00-900.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 900.00-960.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 960.00-1020.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 1020.00-1080.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 1080.00-1140.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 1140.00-1200.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 1200.00-1260.00 sec 7.19 MBytes 1.01 Mbits/sec 0 32.5 KBytes [ 4] 1260.00-1320.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 1320.00-1380.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 1380.00-1440.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 1440.00-1500.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 1500.00-1560.00 sec 7.13 MBytes 997 Kbits/sec 0 32.5 KBytes [ 4] 1560.00-1620.00 sec 7.19 MBytes 1.01 Mbits/sec 0 32.5 KBytes [ 4] 1620.00-1680.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 1680.00-1740.00 sec 7.13 MBytes 997 Kbits/sec 0 32.5 KBytes [ 4] 1740.00-1800.00 sec 7.19 MBytes 1.01 Mbits/sec 0 32.5 KBytes [ 4] 1800.00-1860.00 sec 7.13 MBytes 997 Kbits/sec 0 32.5 KBytes [ 4] 1860.00-1920.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 1920.00-1980.00 sec 7.19 MBytes 1.01 Mbits/sec 0 29.7 KBytes [ 4] 1980.00-2040.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 2040.00-2100.00 sec 7.13 MBytes 997 Kbits/sec 0 33.9 KBytes [ 4] 2100.00-2160.00 sec 7.19 MBytes 1.01 Mbits/sec 0 29.7 KBytes [ 4] 2160.00-2220.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 2220.00-2280.00 sec 7.13 MBytes 997 Kbits/sec 0 32.5 KBytes [ 4] 2280.00-2340.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 2340.00-2400.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 2400.00-2460.00 sec 7.13 MBytes 997 Kbits/sec 0 28.3 KBytes [ 4] 2460.00-2520.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 2520.00-2580.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 2580.00-2640.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 2640.00-2700.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 2700.00-2760.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 2760.00-2820.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 2820.00-2880.00 sec 7.19 MBytes 1.01 Mbits/sec 0 29.7 KBytes [ 4] 2880.00-2940.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 2940.00-3000.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 3000.00-3060.00 sec 7.19 MBytes 1.01 Mbits/sec 0 32.5 KBytes [ 4] 3060.00-3120.00 sec 7.13 MBytes 997 Kbits/sec 0 28.3 KBytes [ 4] 3120.00-3180.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 3180.00-3240.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 3240.00-3300.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 3300.00-3360.00 sec 7.13 MBytes 997 Kbits/sec 0 29.7 KBytes [ 4] 3360.00-3420.00 sec 7.19 MBytes 1.01 Mbits/sec 0 31.1 KBytes [ 4] 3420.00-3480.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes [ 4] 3480.00-3540.00 sec 7.13 MBytes 997 Kbits/sec 0 31.1 KBytes iperf3: error - unable to receive control message: Connection timed out Connection to 128.0.1.9 closed. Logging STDOUT and STDERR ending on Fri Oct 30 12:42:05 2015 Sys info psvt@cmts ~ $ iperf3 --version iperf 3.1 Linux cmts 3.2.0-4-amd64 #1 SMP Debian 3.2.65-1+deb7u2 x86_64 Optional features available: CPU affinity setting, IPv6 flow label, TCP congestion algorithm setting, sendfile / zerocopy pi@ARe1 ~ $ iperf3 --version iperf 3.1 Linux ARe1 3.12.26+ #707 PREEMPT Sat Aug 30 17:39:19 BST 2014 armv6l Optional features available: CPU affinity setting, IPv6 flow label, TCP congestion algorithm setting, sendfile / zerocopyNo matter what the -t value is, as long as it is over 600 or so, the same behaviour is exhibited -- iperf3 runs until just a few seconds before the run is scheduled to end, waits for about 15 minutes, then complains about not receiving a control message because of a Connection timeout. SSH TCPKeepAlive is on. I can confirm using tcpdump that there is network activity over that port right up until the end of the run is scheduled, and then nothing during the timeout period. I have tried to recreate the problem using pv and netcat, and am unable to, which leads me to believe that this is a iperf3 problem. Not sure how to move forward. Could you suggest another setting to look at? Perhaps this is a bug with iperf3? |
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