[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


--- 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

  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

  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

_U  stable/12/

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