[Bug 251052] [sctp] Throughput becomes extremely low under load

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 23 Apr 2022 04:11:27 UTC

--- Comment #11 from bc979@lafn.org ---
(In reply to Bryan Drewery from comment #9)

It appears that iperf3 does not use multiple streams regardless of the settings
for the arguments.  With nstreams set to > 1, tcpdump shows that the SCTP field
SID is always 0.  Looking through the code, the actual write statement used
does not support including a stream pointer.  I suspect that was overlooked in
the last update.  The code does call a sctp_write like function, but it is just
set to their standard write module.  Iperf3 will not test this problem although
it does sort of indicate a problem since the throughput basically goes to zero.
 This just might be a problem in iperf3 rather than in SCTP.

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