From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264304AbTF3OHM (ORCPT ); Mon, 30 Jun 2003 10:07:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264340AbTF3OHM (ORCPT ); Mon, 30 Jun 2003 10:07:12 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.104]:14295 "EHLO e4.ny.us.ibm.com") by vger.kernel.org with ESMTP id S264304AbTF3OHK (ORCPT ); Mon, 30 Jun 2003 10:07:10 -0400 Subject: Evaluation of three I/O schedulers To: linux-kernel@vger.kernel.org Cc: Andrew Morton , "Mike Sullivan" , "Bill Hartner" , "Ray Venditti" X-Mailer: Lotus Notes Release 5.0.8 June 18, 2001 Message-ID: From: "Peter Wong" Date: Mon, 30 Jun 2003 09:21:24 -0500 X-MIMETrack: Serialize by Router on D01ML072/01/M/IBM(Release 5.0.11 +SPRs MIAS5EXFG4, MIAS5AUFPV and DHAG4Y6R7W, MATTEST |November 8th, 2002) at 06/30/2003 10:21:28 AM MIME-Version: 1.0 Content-type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org We used 2.5.72+mm1 to evaluate three I/O schedulers, namely anticipatory, deadline and complete fair queueing under a very heavy database workload on an 8-way Pentium 4 machine. The workload is a decision support system doing mostly sequential I/O and each run takes about one hour. All three runs finished completely without encountering functional problems, and achieved similar performance level. The 8-way machine has Pentium 4 2.0 GHz processors, 16 GB physical memory, 2MB L3 cache, 8 FC controllers with 80 disks. Hyperthreading was turned on for the three runs. The CPU utilization is similar for all three runs: 65% user, 7% system and 28% idle. Regards, Peter Peter Wai Yee Wong IBM Linux Technology Center Performance Team email: wpeter@us.ibm.com