Date: Mon, 3 Jul 2006 08:37:04 +0800 From: David Xu <davidxu@freebsd.org> To: freebsd-performance@freebsd.org Subject: Re: Updated fine-grain locking patch for UNIX domain sockets Message-ID: <200607030837.04685.davidxu@freebsd.org> In-Reply-To: <20060630001142.Y67344@fledge.watson.org> References: <20060630001142.Y67344@fledge.watson.org>
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On Friday 30 June 2006 07:14, Robert Watson wrote: > Attached, and at the below URL, find an updated copy of the UNIX domain > socket fine-grained locking patch. Since the last revision, I've updated > the patch to close several race conditions historically present in UNIX > domain sockets (which should be merged regardless of the rest of the > patch), as well as move to an rwlock for the global lock. > > > http://www.watson.org/~robert/freebsd/netperf/20060630-uds-fine-grain.diff > > This patch increases locking overhead, but decreases contention. Depending > on the number of CPUs, it may improve (or not) performance to varying > degrees; very good reports on sun4v; middling reports on 2-proc, etc. > Stability and performance results for UNIX domain socket sensitive > workloads, such as MySQL, X11, etc, would be appreciated. Micro-benchmark > performance should show a small loss, but load under contention and > scalability are (ideally) improved. > > Robert N M Watson > Computer Laboratory > University of Cambridge > I found 5% performance decrease on dual P4, maybe P4 is quite bad when doing atomic operation. ;-) Thanks, David Xu
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