Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030203AbXAKC6S (ORCPT ); Wed, 10 Jan 2007 21:58:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030202AbXAKC6R (ORCPT ); Wed, 10 Jan 2007 21:58:17 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:40654 "EHLO omx2.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1030190AbXAKC6R (ORCPT ); Wed, 10 Jan 2007 21:58:17 -0500 Date: Thu, 11 Jan 2007 13:57:37 +1100 From: David Chinner To: Christoph Lameter Cc: David Chinner , Nick Piggin , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown Message-ID: <20070111025737.GZ33919298@melbourne.sgi.com> References: <20070110223731.GC44411608@melbourne.sgi.com> <20070110230855.GF44411608@melbourne.sgi.com> <45A57333.6060904@yahoo.com.au> <20070111003158.GT33919298@melbourne.sgi.com> <20070111010605.GU33919298@melbourne.sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1490 Lines: 35 On Wed, Jan 10, 2007 at 05:40:26PM -0800, Christoph Lameter wrote: > On Thu, 11 Jan 2007, David Chinner wrote: > > > On Wed, Jan 10, 2007 at 04:43:36PM -0800, Christoph Lameter wrote: > > > You are comparing a debian 2.6.18 standard kernel with your tuned version > > > of 2.6.20-rc3. There may be a lot of differences. Could you get us the > > > config? Or use the same config file and build 2.6.20/18 the same way. > > > > I took the /proc/config.gz from the debian 2.6.18-1 kernel as the > > base config for the 2.6.20-rc3 kernel and did a make oldconfig on > > it to make sure it was valid for the newer kernel but pretty much > > the same. I think that's the right process, so I don't think > > different build configs are the problem here. > > Debian may have added extra patches that are not upstream. I see f.e. some > of my post 2.6.18 patches in there. Did you read the thread I linked in my original report? The original bug report was for a regression from 2.6.18.1 to 2.6.20-rc3. I have reproduced the same regression between the debian 2.6.18-1 kernel and 2.6.20-rc3. I think you're looking in the wrong place for the cause of the problem.... Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/