From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261362AbVFMEDH (ORCPT ); Mon, 13 Jun 2005 00:03:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261364AbVFMEDH (ORCPT ); Mon, 13 Jun 2005 00:03:07 -0400 Received: from relay02.mail-hub.dodo.com.au ([202.136.32.45]:41188 "EHLO relay02.mail-hub.dodo.com.au") by vger.kernel.org with ESMTP id S261362AbVFMEDD (ORCPT ); Mon, 13 Jun 2005 00:03:03 -0400 From: Grant Coady To: linux-kernel@vger.kernel.org Subject: Odd IDE performance drop 2.4 vs 2.6? Date: Mon, 13 Jun 2005 14:03:01 +1000 Organization: Message-ID: X-Mailer: Forte Agent 2.0/32.652 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi there, A new 'old' box, with near 3:1 hdparm -Tt /dev/hda performance drop comparing 2.4.31 with 2.6.11.12. pII/266 on 440LX chipset. HDD set to udma2 (max for h/w) with manuf. utility. Single master on ribbon. CDROM on other ribbon. Two runs each via ssh login soon after boot: Linux 2.4.31-si. root@silly:~# hdparm -tT /dev/hda /dev/hda: Timing cached reads: 344 MB in 1.99 seconds = 172.86 MB/sec Timing buffered disk reads: 68 MB in 3.02 seconds = 22.52 MB/sec root@silly:~# hdparm -tT /dev/hda /dev/hda: Timing cached reads: 356 MB in 2.00 seconds = 178.00 MB/sec Timing buffered disk reads: 68 MB in 3.04 seconds = 22.37 MB/sec root@silly:~# Linux 2.6.11.12a. root@silly:~# hdparm -tT /dev/hda /dev/hda: Timing cached reads: 340 MB in 2.01 seconds = 168.76 MB/sec Timing buffered disk reads: 26 MB in 3.02 seconds = 8.60 MB/sec root@silly:~# hdparm -tT /dev/hda /dev/hda: Timing cached reads: 340 MB in 2.01 seconds = 169.26 MB/sec Timing buffered disk reads: 26 MB in 3.02 seconds = 8.61 MB/sec root@silly:~# Hardware info, configs, etc at http://scatter.mine.nu/test/boxen/silly/ --Grant.