[Bug 243590] TCP ECN not adhering extremely strictly to RFC3168 can cause massive TCP perf issues
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Wed Jun 24 16:18:17 UTC 2020
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243590
--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:
Author: rscheff
Date: Wed Jun 24 16:17:59 UTC 2020
New revision: 362586
URL: https://svnweb.freebsd.org/changeset/base/362586
Log:
MFC r361347: With RFC3168 ECN, CWR SHOULD only be sent with new data
Overly conservative data receivers may ignore the CWR flag on other
packets, and keep ECE latched. This can result in continous reduction
of the congestion window, and very poor performance when ECN is
enabled.
PR: 243590
Reviewed by: rgrimes (mentor), rrs
Approved by: rgrimes (mentor, blanket)
MFC after: 3 weeks
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D23364
Changes:
_U stable/12/
stable/12/sys/netinet/tcp_input.c
stable/12/sys/netinet/tcp_output.c
stable/12/sys/netinet/tcp_stacks/rack.c
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