Date: Tue, 04 Dec 2007 12:25:03 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD Message-ID: <1196771103.71694.8.camel@localhost> In-Reply-To: <fj3f75$skn$1@ger.gmane.org> References: <20071201213732.GA16638@cannabis.dataforce.net> <1497741406.20071201230441@rulez.sk> <20071202174540.GA29572@cannabis.dataforce.net> <200712020844.49718.linimon@FreeBSD.org> <4753C9E4.1060200@chistydom.ru> <20071203114037.G79674@fledge.watson.org> <47542372.3040303@chistydom.ru> <20071203163353.J79674@fledge.watson.org> <47551C1C.3000903@chistydom.ru> <47553170.90409@bulinfo.net> <fj3f75$skn$1@ger.gmane.org>
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[-- Attachment #1 --] On Tue, 2007-12-04 at 13:00 +0100, Ivan Voras wrote: > Krassimir Slavchev wrote: > > > There is another report for such problems: > > > > http://blog.insidesystems.net/articles/2007/04/09/what-did-i-do-wrong > > Of course - FreeBSD 6.x is really bad at SMP where number of CPUs is > larger then about 2 and the loads include much kernel work (e.g. IO, > context switches). Numeric tasks (SSL) don't depend on the kernel and so > they scale ok. See > http://people.freebsd.org/~kris/scaling/Scalability%20Update.pdf for > details. > > Another issue is interesting in this thread: that apparently 7.0 also > has a well defined workload where it fails. > There is also his follow up to that post, comparing postgres on 6.2 with 7.0 (ULE and 4BSD schedulers). http://blog.insidesystems.net/articles/2007/04/11/postgresql-scaling-on-6-2-and-7-0 I'm very excited about getting some 7.0 servers into testing prior to deployment as production mysql boxes. Having run 7-CURRENT on my lappy for best part of 15 months, I think its supersmashinggreat :) Tom [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBHVUcalcRvFfyds/cRAjxvAJ4vCOAzCl+wo7qKSHlPXcV/6wmtZwCdG6fh J+jqyDvynP0FaX7Y9X3WkvA= =Lixa -----END PGP SIGNATURE-----
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