From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 23 Jan 2003 21:01:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 23 Jan 2003 21:01:16 -0500 Received: from packet.digeo.com ([12.110.80.53]:30652 "EHLO packet.digeo.com") by vger.kernel.org with ESMTP id ; Thu, 23 Jan 2003 21:01:16 -0500 Date: Thu, 23 Jan 2003 18:10:42 -0800 From: Andrew Morton To: rwhron@earthlink.net Cc: linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net Subject: Re: big ext3 sequential write improvement in 2.5.51-mm1 gone in 2.5.53-mm1? Message-Id: <20030123181042.025fcbbf.akpm@digeo.com> In-Reply-To: <20030124012618.GA12005@rushmore> References: <20030124012618.GA12005@rushmore> X-Mailer: Sylpheed version 0.8.9 (GTK+ 1.2.10; i586-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 24 Jan 2003 02:10:21.0317 (UTC) FILETIME=[BF89C350:01C2C34D] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org rwhron@earthlink.net wrote: > > Did you add a secret sauce to 2.5.59-mm2? I have not been paying any attention to the I/O scheduler changes for a couple of months, so I can't say exactly what caused this. Possibly Nick's batch expiry logic which causes the scheduler to alternate between reading and writing with fairly coarse granularity. > 10x sequential write improvement on ext3 for multiple tiobench threads. OK... I _have_ been paying attention to the IO scheduler for the past few days. -mm5 will have the first draft of the anticipatory IO scheduler. This of course is yielding tremendous improvements in bandwidth when there are competing reads and writes. I expect it will take another week or two to get the I/O scheduler changes really settled down. Your assistance in thoroughly benching that would be appreciated. > 2.4.20aa1 8.24 7.21% 28.587 449134.11 0.10395 0.07086 114 > 2.5.59 9.50 5.50% 36.703 4310.62 0.00000 0.00000 173 > 2.5.59-mm2 35.28 17.69% 10.173 18950.56 0.01010 0.00000 199 boggle.