Date: Wed, 15 Sep 2010 10:39:30 +0000 (UTC) From: Andre Oppermann <andre@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/netinet tcp.h Message-ID: <201009151039.o8FAdcbG064949@repoman.freebsd.org>
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andre 2010-09-15 10:39:30 UTC
FreeBSD src repository
Modified files:
sys/netinet tcp.h
Log:
SVN rev 212653 on 2010-09-15 10:39:30Z by andre
Change the default MSS for IPv4 and IPv6 TCP connections from an
artificial power-of-2 rounded number to their real values specified
in RFC879 and RFC2460.
From the history and existing comments it appears that the rounded
numbers were intended to be advantageous for the kernel and mbuf
system. However this hasn't been the case at for at least a long
time. The mbuf clusters used in tcp_output() have enough space
to hold the larger real value for the default MSS for both IPv4 and
IPv6. Note that the default MSS is only used when path MTU discovery
is disabled.
Update and expand related comments.
Reviewed by: lsteward (including some word-smithing)
MFC after: 2 weeks
Revision Changes Path
1.46 +27 -19 src/sys/netinet/tcp.h
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