Date: Mon, 8 May 2006 20:43:28 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Kris Kennaway <kris@obsecurity.org> Cc: performance@FreeBSD.org, Robert Watson <rwatson@FreeBSD.org>, current@FreeBSD.org Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) Message-ID: <20060509004328.GB55852@xor.obsecurity.org> In-Reply-To: <20060508065207.GA20386@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>
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--WYTEVAkct0FjGQmd Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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. Kris --WYTEVAkct0FjGQmd Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEX+WvWry0BWjoQKURAt8YAKCPaRA18V5W8hP+Oafj2+7gPDJd2QCfeNaW vxHwPuOyQDZfJ9KVeJGH14o= =Ik2U -----END PGP SIGNATURE----- --WYTEVAkct0FjGQmd--
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