Date: Thu, 23 Feb 2017 18:14:36 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r314155 - head/sys/netinet Message-ID: <201702231814.v1NIEahd095397@repo.freebsd.org>
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Author: tuexen Date: Thu Feb 23 18:14:36 2017 New Revision: 314155 URL: https://svnweb.freebsd.org/changeset/base/314155 Log: TCP window updates are only sent if the window can be increased by at least 2 * MSS. However, if the receive buffer size is small, this might be impossible. Add back a criterion to send a TCP window update if the window can be increased by at least half of the receive buffer size. This condition was removed in r242252. This patch simply brings it back. PR: 211003 Reviewed by: gnn MFC after: 1 week Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D9475 Modified: head/sys/netinet/tcp_output.c Modified: head/sys/netinet/tcp_output.c ============================================================================== --- head/sys/netinet/tcp_output.c Thu Feb 23 17:56:24 2017 (r314154) +++ head/sys/netinet/tcp_output.c Thu Feb 23 18:14:36 2017 (r314155) @@ -696,6 +696,8 @@ after_sack_rexmit: recwin <= (so->so_rcv.sb_hiwat / 8) || so->so_rcv.sb_hiwat <= 8 * tp->t_maxseg)) goto send; + if (2 * adv >= (int32_t)so->so_rcv.sb_hiwat) + goto send; } dontupdate:
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