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>
next in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200407271634.i6RGYmaO042219>