Date: Mon, 30 Jun 2008 18:26:43 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/netinet udp_usrreq.c Message-ID: <200806301826.m5UIQpsl014625@repoman.freebsd.org>
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rwatson 2008-06-30 18:26:43 UTC
FreeBSD src repository
Modified files:
sys/netinet udp_usrreq.c
Log:
SVN rev 180127 on 2008-06-30 18:26:43Z by rwatson
In udp_append() and udp_input(), make use of read locking on incpbs
rather than write locking: while we need to maintain a valid reference
to the inpcb and fix its state, no protocol layer state is modified
during an IPv4 UDP receive -- there are only changes at the socket
layer, which is separately protected by socket locking.
While parallel concurrent receive on a single UDP socket is currently
relatively unusual, introducing read locking in the transmit path,
allowing concurrent receive and transmit, will significantly improve
performance for loads such as BIND, memcached, etc.
MFC after: 2 months
Tested by: gnn, kris, ps
Revision Changes Path
1.223 +8 -8 src/sys/netinet/udp_usrreq.c
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