Date: Sat, 6 May 2006 15:20:52 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: current@FreeBSD.org Cc: performance@FreeBSD.org Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) Message-ID: <20060506152016.I17611@fledge.watson.org> In-Reply-To: <20060506150622.C17611@fledge.watson.org> References: <20060506150622.C17611@fledge.watson.org>
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On Sat, 6 May 2006, Robert Watson wrote: > Attached, please find a patch implementing more fine-grained locking for the > POSIX local socket subsystem (UNIX domain socket subsystem). In the current > implementation, we use a single global subsystem lock to protect all local > IPC over the PF_LOCAL socket type. This has low overhead, but can result in > significant contention, especially for workloads like MySQL which push a > great deal of data through UNIX domain sockets, and involve many parties. > The hope is that by improving granularity, we can reduce contention > sufficiently to overcome the added cost of increased locking overhead (a > side-effect of greater granularity). At a high level, here are the changes > made: FYI, you can download a copy unmangled by my and your mail systems at the following URL: http://www.watson.org/~robert/freebsd/netperf/20060506a-uds-fine-grain.diff Robert N M Watson
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