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

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243590

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: rscheff
Date: Sun May 24 17:51:14 UTC 2020
New revision: 361436
URL: https://svnweb.freebsd.org/changeset/base/361436

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.

  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:  rgrimes (mentor), tuexen (mentor)
  MFC after:    3 days
  Sponsored by: NetApp, Inc.
  Differential Revision:        https://reviews.freebsd.org/D23364

Changes:
_U  stable/11/
  stable/11/sys/netinet/tcp_input.c
  stable/11/sys/netinet/tcp_output.c

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