Date: Sat, 29 Sep 2007 20:08:53 +0300 From: "Abdullah Ibn Hamad Al-Marri" <almarrie@gmail.com> To: "Kris Kennaway" <kris@freebsd.org> Cc: freebsd-questions@freebsd.org Subject: Re: Questions on the scheduler Message-ID: <499c70c0709291008y3d42adc4u68fa0f717088f94e@mail.gmail.com> In-Reply-To: <46FE8120.4040608@FreeBSD.org> References: <80f4f2b20709240723m121aad88ofaf728f384dd6c20@mail.gmail.com> <20070924184415.7bffd7d2@gumby.homeunix.com.> <46FE790A.1000101@FreeBSD.org> <20070929163116.GA1748@olymp.home> <46FE8120.4040608@FreeBSD.org>
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On 9/29/07, Kris Kennaway <kris@freebsd.org> wrote: > Oliver Herold wrote: > > Are there any numbers or technical papers? Just out of curiosity. > > I ran a mysql benchmark against Dragonfly-current and FreeBSD 7 on an > 8-core machine (one of the workloads that FreeBSD now performs very well > at) and found 0 scaling on dragonfly. Their developers confirmed that > the kernel is still entirely giant locked (as in FreeBSD 4) so no SMP > performance benefits are possible. > > The email thread is here: > > http://leaf.dragonflybsd.org/mailarchive/users/2007-05/msg00134.html > > although the linked graph is offline. The FreeBSD curve was essentially > this one (FreeBSD has improved further since then): > > http://people.freebsd.org/~kris/scaling/scaling.png > > with dragonfly a flat line at ~500 tps independent of load. > > Kris How does NetBSD, and OpenBSD scale when it comes to SMP comparing to FreeBSD 7.0? -- Regards, -Abdullah Ibn Hamad Al-Marri Arab Portal http://www.WeArab.Net/
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