Date: Mon, 18 Apr 2011 17:43:16 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/netinet tcp_output.c Message-ID: <201104181743.p3IHhXGK022214@repoman.freebsd.org>
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jhb 2011-04-18 17:43:16 UTC
FreeBSD src repository
Modified files:
sys/netinet tcp_output.c
Log:
SVN rev 220794 on 2011-04-18 17:43:16Z by jhb
When checking to see if a window update should be sent to the remote peer,
don't force a window update if the window would not actually grow due to
window scaling. Specifically, if the window scaling factor is larger than
2 * MSS, then after the local reader has drained 2 * MSS bytes from the
socket, a window update can end up advertising the same window. If this
happens, the supposed window update actually ends up being a duplicate ACK.
This can result in an excessive number of duplicate ACKs when using a
higher maximum socket buffer size.
Reviewed by: bz
MFC after: 1 month
Revision Changes Path
1.177 +8 -0 src/sys/netinet/tcp_output.c
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