Date: Tue, 20 Nov 2007 14:26:34 +0300 From: Alexey Popov <lol@chistydom.ru> To: Kris Kennaway <kris@FreeBSD.org> Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD Message-ID: <4742C46A.1060701@chistydom.ru> In-Reply-To: <4742ADFE.40902@FreeBSD.org> References: <4741905E.8050300@chistydom.ru> <fhs3s5$knj$1@ger.gmane.org> <47419AB3.5030008@chistydom.ru> <fhs7hp$2es$2@ger.gmane.org> <4741A7DA.2050706@chistydom.ru> <4741DA15.9000308@FreeBSD.org> <47429DB8.7040504@chistydom.ru> <4742ADFE.40902@FreeBSD.org>
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Hi Kris Kennaway wrote: >>>>>> CPU states: 9.5% user, 0.0% nice, 82.0% system, 0.5% >>>>>> interrupt, 8.0% idle >>>>> A wild idea that might not help: try reducing kern.hz in >>>>> loader.conf to >>>>> something like 100 and see if something significant changes. >> Usually on PHP backends slow PHP code eats most of the CPU time. I >> have %user much bigger than %system in CPU states. >> But now %system is much bigger than %user and I can conclude that on >> 8-core server FreeBSD consumes more CPU time than PHP. > That is one possibility, but you still need to look at the actual > throughput on these machines before making conclusions about which is > performing better. Can you please provide those numbers for 6.x, 7.x > with ULE and 4BSD on the 4-core and 8-core systems? Ok, here's results of practical research. The following is approximate maximum qps that backends can survive with my workload: 7-STABLE quad ULE 20 7-STABLE quad 4BSD 17 6-STABLE quad 14 6-STABLE dual 21 Linux CentOS 5 quad >50 With best regards, Alexey Popov
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