Date: Sat, 29 Sep 2007 19:04:38 +0200 From: Oliver Herold <oliver@akephalos.de> To: freebsd-questions@freebsd.org Subject: Re: Questions on the scheduler Message-ID: <20070929170438.GA1919@olymp.home> 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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Thanks :-) Cheers, Oliver On Sat, Sep 29, 2007 at 06:45:20PM +0200, Kris Kennaway 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 > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" -- Per buck you get more computing action with the small computer. -- R. W. Hamming
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