Date: Sat, 29 Sep 2007 18:45:20 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: freebsd-questions@freebsd.org Subject: Re: Questions on the scheduler Message-ID: <46FE8120.4040608@FreeBSD.org> In-Reply-To: <20070929163116.GA1748@olymp.home> References: <80f4f2b20709240723m121aad88ofaf728f384dd6c20@mail.gmail.com> <20070924184415.7bffd7d2@gumby.homeunix.com.> <46FE790A.1000101@FreeBSD.org> <20070929163116.GA1748@olymp.home>
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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
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