From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759449AbYEIILH (ORCPT ); Fri, 9 May 2008 04:11:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754552AbYEIIKt (ORCPT ); Fri, 9 May 2008 04:10:49 -0400 Received: from viefep20-int.chello.at ([62.179.121.40]:42034 "EHLO viefep20-int.chello.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754635AbYEIIKr (ORCPT ); Fri, 9 May 2008 04:10:47 -0400 Subject: Re: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1 From: Peter Zijlstra To: Mike Galbraith Cc: "Zhang, Yanmin" , LKML , Ingo Molnar , Dhaval Giani In-Reply-To: <1210319983.5250.4.camel@marge.simson.net> References: <1210136148.3453.59.camel@ymzhang> <1210177575.6525.4.camel@lappy.programming.kicks-ass.net> <1210228531.3453.124.camel@ymzhang> <1210233617.4895.6.camel@marge.simson.net> <1210237267.3453.143.camel@ymzhang> <1210238114.11887.3.camel@marge.simson.net> <1210238622.13978.193.camel@twins> <1210295779.3453.155.camel@ymzhang> <1210315870.13978.204.camel@twins> <1210318362.15296.4.camel@marge.simson.net> <1210319417.13978.207.camel@twins> <1210319983.5250.4.camel@marge.simson.net> Content-Type: text/plain Date: Fri, 09 May 2008 10:10:46 +0200 Message-Id: <1210320646.13978.211.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.22.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2008-05-09 at 09:59 +0200, Mike Galbraith wrote: > On Fri, 2008-05-09 at 09:50 +0200, Peter Zijlstra wrote: > > On Fri, 2008-05-09 at 09:32 +0200, Mike Galbraith wrote: > > > On Fri, 2008-05-09 at 08:51 +0200, Peter Zijlstra wrote: > > > > > > > -rc1. Do you have the fix below applied? > > > > > > > > > > > > Oooh - good catch, that seems to be a post -rc1 merge. > > > > > > > > > > > > Yes this is required. > > > > > > > > > With below patch+previous_fix_weight_calc, the result is improved, but is still > > > > > about 10% worse than the one of pure 2.6.26-rc1. > > > > > Number of threads: 16 > > > > > read/write requests: 6104336 (50867.11 per sec.) > > > > > > > > > > > > > So puzzling - could you try -git + fix_weight_calc, as I think that is > > > > what Mike tested and proved good on his Quad. > > > > > > If he still has group scheduling enabled, my box agrees that there's a > > > regression. I got mysql running, and tested with group scheduling both > > > enabled and disabled, results attached. (for some reason, I can only > > > test up to 64 threads with mysql though) > > > > Hm, ok. Does the patch at hand improve or regress the group config for > > you? > > Oh, you want me to revert it and retest group? Yes, I guess that would be what I'm asking ;-)