From owner-freebsd-stable@FreeBSD.ORG Fri Nov 23 10:57:30 2007 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0AF4416A468; Fri, 23 Nov 2007 10:57:30 +0000 (UTC) (envelope-from kris@FreeBSD.org) Received: from weak.local (pointyhat.freebsd.org [IPv6:2001:4f8:fff6::2b]) by mx1.freebsd.org (Postfix) with ESMTP id 5E16613C457; Fri, 23 Nov 2007 10:57:28 +0000 (UTC) (envelope-from kris@FreeBSD.org) Message-ID: <4746B21F.7050906@FreeBSD.org> Date: Fri, 23 Nov 2007 11:57:35 +0100 From: Kris Kennaway User-Agent: Thunderbird 2.0.0.9 (Macintosh/20071031) MIME-Version: 1.0 To: Alexey Popov References: <4741905E.8050300@chistydom.ru> <47419AB3.5030008@chistydom.ru> <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> <47468165.5010906@chistydom.ru> In-Reply-To: <47468165.5010906@chistydom.ru> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: Attilio Rao , freebsd-stable@freebsd.org Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Nov 2007 10:57:30 -0000 Alexey Popov wrote: > 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. OK, please compare ULE to ULE with and without my patch (and remembering to enable the sysctl), and obtain lock profiling traces in both cases under identical workloads & durations. That is what I need to proceed with this issue. >> 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 There are patches you need to enable it on woodcrest. They are in my p4 branch (kris-contention) but I don't have time right now to extract them. > 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. Sounds like it. > Is kgmon profiling usable on FreeBSD 7? I've never bothered, it is likely to be quite slow, so it can totally change the workload you are trying to profile. Kris