[Bug 243590] TCP ECN not adhering extremely strictly to RFC3168 can cause massive TCP perf issues

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Wed May 27 22:35:25 UTC 2020


--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: rscheff
Date: Wed May 27 22:34:47 UTC 2020
New revision: 361565
URL: https://svnweb.freebsd.org/changeset/base/361565

  MFS r361436: MFC r361347: With RFC3168 ECN, CWR SHOULD only be sent with new

  Overly conservative data receivers may ignore the CWR flag on other
  packets, and keep ECE latched. This can result in continuous reduction
  of the congestion window, and very poor performance when ECN is

  This does NOT contain the merge of the change to RACK since at this
  time that code does not exist in stable/11, and there is no plan to
  merge RACK to stable/11.

  PR:           243590
  Reviewed by:  rgrimes (mentor), rrs
  Approved by:  re(gjb)
  Sponsored by: NetApp, Inc.
  Differential Revision:        https://reviews.freebsd.org/D23364

_U  releng/11.4/

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