Date: Fri, 23 Nov 2007 10:29:41 +0300 From: Alexey Popov <lol@chistydom.ru> To: Kris Kennaway <kris@FreeBSD.org> Cc: Attilio Rao <attilio@freebsd.org>, freebsd-stable@freebsd.org Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD Message-ID: <47468165.5010906@chistydom.ru> In-Reply-To: <4745E5B3.6060200@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> <4742C46A.1060701@chistydom.ru> <47432F77.3030606@FreeBSD.org> <474339E9.4080301@FreeBSD.org> <4743629B.9090408@FreeBSD.org> <47456B71.5040205@chistydom.ru> <4745E5B3.6060200@FreeBSD.org>
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Hi. Kris Kennaway wrote: >> Now FreeBSD 7-STABLE ULE 8-core server without optimized PHP >> realpath_cache_size (producing 2000+ lstats per request) can handle up >> to ~24 rps as opposed to max. 17 rps without your patch. %sys never >> grows over %user with your patch. On the server with optimized >> realpath_cache_size there's no visible influence of your patch. > > You said "20" before for this configuration, so I'm a bit suspicious > about how seriously to treat your measurements :) Sorry, my mistake. s/ULE/4BSD. > Anyway, please obtain another lock profiling trace using the same > conditions as the previous one (same workload & duration, etc), so we > can compare what changed. OK, I'll make it a little bit later. Also I tried to find what else is slow in FreeBSD, I tried hwpmc as module and in kernel, but it fails with error: pmc: Unknown Intel CPU. module_register_init: MOD_LOAD (hwpmc, 0xffffffff804833e0, 0xffffffff809338a0) error 78 This is related to http://www.freebsd.org/cgi/query-pr.cgi?pr=amd64%2F111994&cat= and it is impossible to use hwpmc with modern CPUs. Is kgmon profiling usable on FreeBSD 7? With best regards, Alexey Popovhome | help
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