From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1767691AbXCJBXV (ORCPT ); Fri, 9 Mar 2007 20:23:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1767708AbXCJBXV (ORCPT ); Fri, 9 Mar 2007 20:23:21 -0500 Received: from waste.org ([66.93.16.53]:46272 "EHLO waste.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2993156AbXCJBXT (ORCPT ); Fri, 9 Mar 2007 20:23:19 -0500 Date: Fri, 9 Mar 2007 19:10:34 -0600 From: Matt Mackall To: Con Kolivas Cc: Willy Tarreau , linux-kernel , akpm@linux-foundation.org Subject: Re: 2.6.21-rc3-mm1 RSDL results Message-ID: <20070310011034.GO10394@waste.org> References: <20070309053931.GA10459@waste.org> <20070309215716.GK943@1wt.eu> <200703100912.07792.kernel@kolivas.org> <200703101202.25814.kernel@kolivas.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200703101202.25814.kernel@kolivas.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Mar 10, 2007 at 12:02:25PM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 09:12, Con Kolivas wrote: > > On Saturday 10 March 2007 08:57, Willy Tarreau wrote: > > > On Fri, Mar 09, 2007 at 03:39:59PM -0600, Matt Mackall wrote: > > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > 5x memload: good > > > > 5x execload: good > > > > 5x forkload: good > > > > 5 parallel makes: mostly good > > > > make -j 5: bad > > > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > > job server uses pipe I/O to control how many jobs are running. > > > > > > Matt, could you check with plain 2.6.20 + Con's patch ? It is possible > > > that he added bugs when porting to -mm, or that someting in -mm causes > > > the trouble. Your experience with -mm seems so much different from mine > > > with mainline, there must be a difference somewhere ! > > > > Good idea. > > It's all very odd Matt. It really isn't behaving anything like you describe > for myself or others. It sounds more like a real bug than what the design > would do at all. The only things that are different on yours is Beryl and a > different graphics card. When you're comparing to mainline are you > comparing -mm1 to -mm2 to ensure something else from -mm isn't responsible? > Also have you tried rsdl on 2.6.20 as Willy suggested? Haven't tried -mm2. So far I've tried 2.6.21-rc2-mm2 (aka 'stock'), 2.6.21-rc3-mm1, and 2.6.20+rsdl. I also did a test with Metacity and saw the same issues under load. So I think Beryl is not part of the problem. Right now it's looking like the problem is caused by ccache. Disabling ccache with 2.6.21-rc2-mm1+tickfix+noyield lets me run make -j 5 acceptably. So my new column would be: RSDL+NO_HZ+tickfix+noyield+noccache make -j 5 beryl ok/good galeon ok/good mp3 good terminal good mouse good So it's about on par with 2.6.20, maybe slightly better. I suspect ccache lock contention is somehow involved though it doesn't explain why my 5 independent makes test beats out make -j 5. -- Mathematics is the supreme nostalgia of our time.