Date: Mon, 8 Jun 2009 22:42:35 +0200 From: Attilio Rao <attilio@freebsd.org> To: freebsd-arch@freebsd.org, freebsd-smp@freebsd.org Subject: [PATCH] Adaptive spinning for lockmgr Message-ID: <3bbf2fe10906081342i6ef418e0n75e22d0b9e2543b3@mail.gmail.com>
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This patch enables adaptive spinning for lockmgr: http://www.freebsd.org/~attilio/adaptive_lockmgr.diff and it should presumably improve performance on disks/vfs/buffer cache based benchmarks, so, if you want to try out and report any benchmarks result, I'd love to see it. Please note that there are some parameters to tune: for example, you would like to not enable adaptive spinning to default while you just want that for a class of locks (and in that case you want to apply the reversed logic for what is living now) or you want to use different values for retries and loops. Interested developers can refer to such 3 variables. Peter Holm alredy tested that patch for about 24hours without any regression to report. Also note that the patch is not 100% yet as long as it needs UPDATES and manpages updates, but they will be added just in time before to commit. The modify is all there. Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein
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