[Bug 251052] SCTP traffic becomes extremely slow under load

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Nov 11 16:26:37 UTC 2020


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251052

            Bug ID: 251052
           Summary: SCTP traffic becomes extremely slow under load
           Product: Base System
           Version: 11.4-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: preynold.freebsd at gmail.com

Given a service using SCTP, when it receives a spike in traffic, it becomes
extremely slow to respond. A given block of traffic that takes seconds if
spaced out in time, instead takes upwards of 15-20 minutes if received in a
burst. I suspect some sub-optimal behavior when receive buffers are full, but
that is just a wild guess. This behavior is reproducible on both 11.4-RELEASE
and 12.2-RELEASE. I will attach a test program.

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