Date: Mon, 8 May 2006 21:21:06 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Maxim Sobolev <sobomax@FreeBSD.org> Cc: performance@FreeBSD.org, Robert Watson <rwatson@FreeBSD.org>, current@FreeBSD.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) Message-ID: <20060509012106.GA57271@xor.obsecurity.org> In-Reply-To: <445FEDDA.6010001@FreeBSD.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> <445FEDDA.6010001@FreeBSD.org>
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--9jxsPFA5p3P2qPhR Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, May 08, 2006 at 06:18:18PM -0700, Maxim Sobolev wrote: > 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. >=20 > Maybe HDD just can't keep up with the pace? There is no disk I/O involved. Kris --9jxsPFA5p3P2qPhR Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEX+6BWry0BWjoQKURArFWAJ0XbBnww8FPfL/TD3fmr5/1MiBTEQCg0Xca wf4fD55J7ULkaas0a3GlpV4= =+Prk -----END PGP SIGNATURE----- --9jxsPFA5p3P2qPhR--
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