From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261464AbVFMKnu (ORCPT ); Mon, 13 Jun 2005 06:43:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261465AbVFMKnu (ORCPT ); Mon, 13 Jun 2005 06:43:50 -0400 Received: from mailhub3.nextra.sk ([195.168.1.146]:18448 "EHLO mailhub3.nextra.sk") by vger.kernel.org with ESMTP id S261464AbVFMKnr (ORCPT ); Mon, 13 Jun 2005 06:43:47 -0400 Message-ID: <42AD6362.1000109@rainbow-software.org> Date: Mon, 13 Jun 2005 12:43:46 +0200 From: Ondrej Zary User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Grant Coady CC: linux-kernel@vger.kernel.org Subject: Re: Odd IDE performance drop 2.4 vs 2.6? References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Grant Coady wrote: > 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: I see this problem too with i430TX chipset (the south bridge and thus IDE controller is the same as in i440LX/EX and BX/ZX). 2.6.12-rc5: /dev/hda: Timing cached reads: 180 MB in 2.02 seconds = 89.11 MB/sec Timing buffered disk reads: 40 MB in 3.09 seconds = 12.94 MB/sec 2.4.31: /dev/hda: Timing cached reads: 180 MB in 2.03 seconds = 88.67 MB/sec Timing buffered disk reads: 62 MB in 3.01 seconds = 20.60 MB/sec I also noticed that during the buffered read test on 2.6 kernel, the IDE activity LED is blinking (so the drive is not 100% utilised) while it's permanently on with 2.4. > 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. > -- Ondrej Zary