Date: Fri, 10 Jun 2011 18:51:33 +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: <201106101851.p5AIpgrD055662@repoman.freebsd.org>
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jhb 2011-06-10 18:51:33 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_7)
sys/netinet tcp_output.c
Log:
SVN rev 222937 on 2011-06-10 18:51:33Z by jhb
MFC 220794:
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.
Revision Changes Path
1.141.2.18 +8 -0 src/sys/netinet/tcp_output.c
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