[Bug 251052] [sctp] Throughput becomes extremely low under load
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Date: Fri, 22 Apr 2022 22:10:47 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251052
bc979@lafn.org changed:
What |Removed |Added
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CC| |bc979@lafn.org
--- Comment #6 from bc979@lafn.org ---
I believe the iperf3 test case is incorrect. I don't fine --nstreams
documented. However, it does do something and it appears that it sends very
little data the first second and then none after that. The output indicates
that it is only using 1 stream. The proper argument for multiple streams is
-P. Hear are the results using -P 1 when sending on a 100MB LAN between 2
13.1-RC3 systems:
test# iperf3 -c master --sctp -P 1
Connecting to host master, port 5201
[ 5] local 10.0.1.235 port 52689 connected to 10.0.1.250 port 5201
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 13.0 MBytes 109 Mbits/sec
[ 5] 1.00-2.00 sec 11.2 MBytes 94.4 Mbits/sec
[ 5] 2.00-3.00 sec 11.2 MBytes 93.9 Mbits/sec
[ 5] 3.00-4.00 sec 11.2 MBytes 94.4 Mbits/sec
[ 5] 4.00-5.00 sec 11.2 MBytes 94.4 Mbits/sec
[ 5] 5.00-6.00 sec 11.2 MBytes 94.4 Mbits/sec
[ 5] 6.00-7.00 sec 11.2 MBytes 94.4 Mbits/sec
[ 5] 7.00-8.00 sec 11.2 MBytes 93.8 Mbits/sec
[ 5] 8.00-9.00 sec 11.2 MBytes 94.4 Mbits/sec
[ 5] 9.00-10.00 sec 11.2 MBytes 93.8 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate
[ 5] 0.00-10.00 sec 114 MBytes 95.7 Mbits/sec sender
[ 5] 0.00-10.02 sec 112 MBytes 94.2 Mbits/sec receiver
The results are as expected (Well a bit better than I expected actually). Now
changing to -P 2 I get:
test# iperf3 -c master --sctp -P 2
Connecting to host master, port 5201
[ 5] local 10.0.1.235 port 60452 connected to 10.0.1.250 port 5201
[ 7] local 10.0.1.235 port 40730 connected to 10.0.1.250 port 5201
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 9.12 MBytes 76.5 Mbits/sec
[ 7] 0.00-1.00 sec 5.56 MBytes 46.7 Mbits/sec
[SUM] 0.00-1.00 sec 14.7 MBytes 123 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 1.00-2.00 sec 7.50 MBytes 62.9 Mbits/sec
[ 7] 1.00-2.00 sec 3.75 MBytes 31.5 Mbits/sec
[SUM] 1.00-2.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 2.00-3.00 sec 5.69 MBytes 47.7 Mbits/sec
[ 7] 2.00-3.00 sec 5.56 MBytes 46.7 Mbits/sec
[SUM] 2.00-3.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 3.00-4.00 sec 3.81 MBytes 32.0 Mbits/sec
[ 7] 3.00-4.00 sec 7.44 MBytes 62.4 Mbits/sec
[SUM] 3.00-4.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 4.00-5.00 sec 7.62 MBytes 64.0 Mbits/sec
[ 7] 4.00-5.00 sec 3.62 MBytes 30.4 Mbits/sec
[SUM] 4.00-5.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 5.00-6.00 sec 4.12 MBytes 34.6 Mbits/sec
[ 7] 5.00-6.00 sec 7.12 MBytes 59.8 Mbits/sec
[SUM] 5.00-6.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 6.00-7.00 sec 3.69 MBytes 30.9 Mbits/sec
[ 7] 6.00-7.00 sec 7.56 MBytes 63.4 Mbits/sec
[SUM] 6.00-7.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 7.00-8.00 sec 2.69 MBytes 22.5 Mbits/sec
[ 7] 7.00-8.00 sec 8.50 MBytes 71.3 Mbits/sec
[SUM] 7.00-8.00 sec 11.2 MBytes 93.8 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 8.00-9.00 sec 192 KBytes 1.57 Mbits/sec
[ 7] 8.00-9.00 sec 11.1 MBytes 92.8 Mbits/sec
[SUM] 8.00-9.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 9.00-10.00 sec 0.00 Bytes 0.00 bits/sec
[ 7] 9.00-10.00 sec 11.2 MBytes 94.4 Mbits/sec
[SUM] 9.00-10.00 sec 11.2 MBytes 94.4 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate
[ 5] 0.00-10.00 sec 44.4 MBytes 37.3 Mbits/sec sender
[ 5] 0.00-10.06 sec 42.7 MBytes 35.6 Mbits/sec receiver
[ 7] 0.00-10.00 sec 71.4 MBytes 59.9 Mbits/sec sender
[ 7] 0.00-10.06 sec 70.3 MBytes 58.7 Mbits/sec receiver
[SUM] 0.00-10.00 sec 116 MBytes 97.2 Mbits/sec sender
[SUM] 0.00-10.06 sec 113 MBytes 94.3 Mbits/sec receiver
It specifically indicates that there are two streams in use. The sums seem to
be the same as for 1 stream. However, the data transferred each second is
quite uneven. I don't know if that is a feature or bug. I suspect it is just
the way the buffering worked.
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