Date: Mon, 19 Nov 2007 19:24:18 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Alexey Popov <lol@chistydom.ru> Cc: freebsd-stable@freebsd.org, Robert Watson <rwatson@FreeBSD.org> Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD Message-ID: <4741D4D2.4090902@FreeBSD.org> In-Reply-To: <4741B648.7090002@chistydom.ru> References: <4741905E.8050300@chistydom.ru> <20071119140019.V80667@fledge.watson.org> <4741A3A8.4010803@chistydom.ru> <20071119152214.J80667@fledge.watson.org> <4741B648.7090002@chistydom.ru>
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Alexey Popov wrote: > Hi. > > Robert Watson wrote: >>> I tried SCHED_ULE, but got no difference: >> Did you see no change in throughput, or no change in reported CPU use? > No significant changes. > >> We should probably take this thread to performance@ and get Kris >> involved. He may be interested in trying to reproduce your workload >> in our testbed so we can perform measurements of our own, as well as >> getting you to provide profiling information. One of the things we'd >> most like to have are nice potted benchmarks for real-world workloads, >> as that allows us to easily replay them, perform measurements, >> optimize, etc. > I can provide all profiling or configuration information you ask for. > Except I can't provide PHP site source codes. > > Now I'm in situation that I can't install FreeBSD on all new servers > because they are all based on 2xquad-core processors and I can't be sure > it would work good. Running mutex profiling for e.g. 1 minute of representative load would be a useful starting point, as well as hwpmc profiling for the same duration. My guess is that you're hitting contention in the TCP send path, but I missed the start of this conversation so I don't know what problems you are seeing. Kris
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