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Date:      Wed, 29 Apr 2020 21:48:59 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 235256] [net] IW10 without ABC leads to initial window of 11 Segments
Message-ID:  <bug-235256-7501-QSzs3tkmG5@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-235256-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-235256-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235256

--- Comment #8 from commit-hook@freebsd.org ---
A commit references this bug:

Author: rscheff
Date: Wed Apr 29 21:48:53 UTC 2020
New revision: 360477
URL: https://svnweb.freebsd.org/changeset/base/360477

Log:
  Correctly set up the initial TCP congestion window in all cases,
  by not including the SYN bit sequence space in cwnd related calculations.
  Snd_und is adjusted explicitly in all cases, outside the cwnd update,
instead.

  This fixes an off-by-one conformance issue with regular TCP sessions not
  using Appropriate Byte Counting (RFC3465), sending one more packet during
  the initial window than expected.

  PR:           235256
  Reviewed by:  tuexen (mentor), rgrimes (mentor)
  Approved by:  tuexen (mentor), rgrimes (mentor)
  MFC after:    3 weeks
  Sponsored by: NetApp, Inc.
  Differential Revision:        https://reviews.freebsd.org/D19000

Changes:
  head/sys/netinet/tcp_input.c
  head/sys/netinet/tcp_stacks/bbr.c
  head/sys/netinet/tcp_stacks/rack.c

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