From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 11 Jan 2007 12:11:05 +1100 From: David Chinner Subject: Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown Message-ID: <20070111011105.GV33919298@melbourne.sgi.com> References: <20070110223731.GC44411608@melbourne.sgi.com> <20070110230855.GF44411608@melbourne.sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070110230855.GF44411608@melbourne.sgi.com> Sender: owner-linux-mm@kvack.org Return-Path: To: David Chinner Cc: Christoph Lameter , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Thu, Jan 11, 2007 at 10:08:55AM +1100, David Chinner wrote: > On Wed, Jan 10, 2007 at 03:04:15PM -0800, Christoph Lameter wrote: > > On Thu, 11 Jan 2007, David Chinner wrote: > > > > > The performance and smoothness is fully restored on 2.6.20-rc3 > > > by setting dirty_ratio down to 10 (from the default 40), so > > > something in the VM is not working as well as it used to.... > > > > dirty_background_ratio is left as is at 10? > > Yes. FWIW, setting dirty_ratio to 20 instead of 10 fixes the most of the erraticness of the writeback and most of the performance as well. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org