Date: Mon, 08 May 2006 18:18:18 -0700 From: Maxim Sobolev <sobomax@FreeBSD.org> To: Kris Kennaway <kris@obsecurity.org> Cc: Robert Watson <rwatson@FreeBSD.org>, performance@FreeBSD.org, current@FreeBSD.org Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) Message-ID: <445FEDDA.6010001@FreeBSD.org> In-Reply-To: <20060509004328.GB55852@xor.obsecurity.org> References: <20060506150622.C17611@fledge.watson.org> <20060506221908.GB51268@xor.obsecurity.org> <20060507210426.GA4422@xor.obsecurity.org> <20060507214153.GA5275@xor.obsecurity.org> <20060507230430.GA6872@xor.obsecurity.org> <20060508065207.GA20386@xor.obsecurity.org> <20060509004328.GB55852@xor.obsecurity.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Kris Kennaway wrote: > On Mon, May 08, 2006 at 02:52:07AM -0400, Kris Kennaway wrote: >> OK, David's patch fixes the umtx thundering herd (and seems to give a >> 4-6% boost). I also fixed a thundering herd in FILEDESC_UNLOCK (which >> was also waking up 2-7 CPUs at once about 30% of the time) by doing >> s/wakeup/wakeup_one/. This did not seem to give a performance impact >> on this test though. > > Turning down kern.hz from 1000 to 100 also made a big difference on 12 > CPUs (+6.1%). > > Note also that the system is no less than 40% idle during the runs (at > any load), so the bottlenecks are serious. Maybe HDD just can't keep up with the pace? -Maxim
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?445FEDDA.6010001>