Date: Tue, 27 Jul 2004 16:34:48 +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/kern kern_mutex.c src/sys/conf NOTES options Message-ID: <200407271634.i6RGYmaO042219@repoman.freebsd.org>
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rwatson 2004-07-27 16:34:48 UTC FreeBSD src repository Modified files: sys/kern kern_mutex.c sys/conf NOTES options Log: Add "options ADAPTIVE_GIANT" which causes Giant to also be treated in an adaptive fashion when adaptive mutexes are enabled. The theory behind non-adaptive Giant is that Giant will be held for long periods of time, and therefore spinning waiting on it is wasteful. However, in MySQL benchmarks which are relatively Giant-free, running Giant adaptive makes an observable difference on SMP (5% transaction rate improvement). As such, make adaptive behavior on Giant an option so it can be more widely benchmarked. Revision Changes Path 1.1251 +6 -0 src/sys/conf/NOTES 1.468 +1 -0 src/sys/conf/options 1.145 +4 -0 src/sys/kern/kern_mutex.c
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