From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261507AbUKOGdl (ORCPT ); Mon, 15 Nov 2004 01:33:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261517AbUKOGdl (ORCPT ); Mon, 15 Nov 2004 01:33:41 -0500 Received: from corpmail.outblaze.com ([203.86.166.82]:54413 "EHLO corpmail.outblaze.com") by vger.kernel.org with ESMTP id S261507AbUKOGdi (ORCPT ); Mon, 15 Nov 2004 01:33:38 -0500 Date: Mon, 15 Nov 2004 14:33:25 +0800 From: Yusuf Goolamabbas To: linux-kernel@vger.kernel.org Subject: ext3 reservation seems to cause major slowdown in synctest in 2.6.10-rc2 vs 2.6.9 Message-ID: <20041115063325.GA31537@outblaze.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2i X-AntiVirus: checked by Vexira MailArmor (version: 2.0.2-8; VAE: 6.28.0.12; VDF: 6.28.0.70; host: corpmail.outblaze.com) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I have a P3-500 box /384 MB ram and 2 scsi disks (sda and sdb). OS is on sda and test partions is on sdb aic7xxx driver Using anticipatory schedulor with a tag_depth of 4 (this is set via modules.conf) options aic7xxx aic7xxx=global_tag_depth:4 /dev/sdb1 is created with ext3 and htree is enabled. Mounted as /htree synctest obtained from here (synctest tries to simulate an MTA behaviour) http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz I run the following commands on both 2.6.9 and 2.6.10-rc2 /usr/bin/time -p ./synctest -fu -t 100 -p1 -n1 /htree/nfsexport timing results 2.6.9 real 57.35 user 1.37 sys 14.26 2.6.10-rc2 real 86.83 user 1.32 sys 14.02 Mounting with noreservation gives the following numbers real 58.77 user 1.46 sys 14.48