Date: Tue, 04 Dec 2007 13:00:40 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD Message-ID: <fj3f75$skn$1@ger.gmane.org> In-Reply-To: <47553170.90409@bulinfo.net> 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>
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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.
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