Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932836AbXCAAU6 (ORCPT ); Wed, 28 Feb 2007 19:20:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932835AbXCAAU6 (ORCPT ); Wed, 28 Feb 2007 19:20:58 -0500 Received: from ug-out-1314.google.com ([66.249.92.172]:28251 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932836AbXCAAU4 (ORCPT ); Wed, 28 Feb 2007 19:20:56 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=nchcxkUIhvydaf1r7TjQ9GLfGLrXbjbofLsGVjqxIRMrRuKmNe3i7lVpHjYH6Q4ETKxnjNIYyiKHa/+OnssdDKNZkNrTiE00nur3xxQo43diMfiinqcHibDbk8I2b4Ll2N2sTSU2KkLTCXU8KgStj0csnTe9gXIwRtmqoaQYQ5Y= Message-ID: <29495f1d0702281620j43f576ack2d7e942136e8ea56@mail.gmail.com> Date: Wed, 28 Feb 2007 16:20:54 -0800 From: "Nish Aravamudan" To: "Bill Davidsen" Subject: Re: SMP performance degradation with sysbench Cc: "Paulo Marques" , "Rik van Riel" , "=?ISO-8859-1?Q?J.A._Magall=F3n?=" , "Hiro Yoshioka" , davej@redhat.com, harlan@artselect.com, nickpiggin@yahoo.com.au, l_allegrucci@yahoo.it, linux-kernel@vger.kernel.org, mingo@elte.hu, suparna@in.ibm.com, jens.axboe@oracle.com In-Reply-To: <29495f1d0702271852y5aab9d53mbd4b45931a393534@mail.gmail.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_39820_29066912.1172708454089" References: <20070226223645.GA24174@redhat.com> <98df96d30702261632u7479c9b2sce93f80f68bbc8d0@mail.gmail.com> <45E37EA3.3060101@redhat.com> <20070227.130305.424251739.hyoshiok@miraclelinux.com> <45E3B421.603@redhat.com> <20070227091409.6f3d12f9@werewolf-wl> <45E439E4.5030703@redhat.com> <45E4469C.8000505@grupopie.com> <45E4E736.2050505@tmr.com> <29495f1d0702271852y5aab9d53mbd4b45931a393534@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 19249 Lines: 293 ------=_Part_39820_29066912.1172708454089 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On 2/27/07, Nish Aravamudan wrote: > On 2/27/07, Bill Davidsen wrote: > > Paulo Marques wrote: > > > Rik van Riel wrote: > > >> J.A. Magall=F3n wrote: > > >>> [...] > > >>> Its the same to answer 4+4 queries than 8 at half the speed, isn't = it ? > > >> > > >> That still doesn't fix the potential Linux problem that this > > >> benchmark identified. > > >> > > >> To clarify: I don't care as much about MySQL performance as > > >> I care about identifying and fixing this potential bug in > > >> Linux. > > > > > > IIRC a long time ago there was a change in the scheduler to prevent a > > > low prio task running on a sibling of a hyperthreaded processor to sl= ow > > > down a higher prio task on another sibling of the same processor. > > > > > > Basically the scheduler would put the low prio task to sleep during a= n > > > adequate task slice to allow the other sibling to run at full speed f= or > > > a while. > > > If that is the case, turning off CONFIG_SCHED_SMT would solve the pro= blem. > > Note that Intel does make multicore HT processors, and hopefully when > > this code works as intended it will result in more total throughput. My > > supposition is that it currently is NOT working as intended, since > > disabling SMT scheduling is reported to help. > > It does help, but we still drop off, clearly. Also, that's my > baseline, so I'm not able to reproduce the *sharp* dropoff from the > blog post yet. > > > A test with MC on and SMT off would be informative for where to look ne= xt. > > I'm rebooting my box with 2.6.20.1 and exactly this setup now. Here are the results: idle.png: average % idle over 120s runs from 1 to 32 threads transactions.png: TPS over 120s runs from 1 to 32 threads Hope the data is useful. All I can conclude right now is that SMT appears to help (contradicting what I said earlier), but that MC seems to have no effect (or no substantial effect). 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