Date: Sat, 29 Sep 2007 19:24:50 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: Abdullah Ibn Hamad Al-Marri <almarrie@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Questions on the scheduler Message-ID: <46FE8A62.3040602@FreeBSD.org> In-Reply-To: <499c70c0709291008y3d42adc4u68fa0f717088f94e@mail.gmail.com> References: <80f4f2b20709240723m121aad88ofaf728f384dd6c20@mail.gmail.com> <20070924184415.7bffd7d2@gumby.homeunix.com.> <46FE790A.1000101@FreeBSD.org> <20070929163116.GA1748@olymp.home> <46FE8120.4040608@FreeBSD.org> <499c70c0709291008y3d42adc4u68fa0f717088f94e@mail.gmail.com>
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Abdullah Ibn Hamad Al-Marri wrote: > 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? I was unable to boot NetBSD reliably on my hardware (the serial console only worked about 1/8 of the time) and did not even bother with OpenBSD because there is no reason to think they will be a contender for performance. One of the NetBSD developers recently posted a comparison on old 4*pentium 3 hardware, but their numbers are highly suspicious to me since they are way out of line with what I have measured on similar FreeBSD systems. I am waiting to hear back from him about it. Kris
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