From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263121AbUB0Ucl (ORCPT ); Fri, 27 Feb 2004 15:32:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263123AbUB0Ucl (ORCPT ); Fri, 27 Feb 2004 15:32:41 -0500 Received: from uucp.cistron.nl ([62.216.30.38]:19424 "EHLO ncc1701.cistron.net") by vger.kernel.org with ESMTP id S263121AbUB0Uca (ORCPT ); Fri, 27 Feb 2004 15:32:30 -0500 From: dth@ncc1701.cistron.net (Danny ter Haar) Subject: Re: harddisk speed: 2.4.24 20+% faster then 2.6.3 Date: Fri, 27 Feb 2004 20:32:28 +0000 (UTC) Organization: Cistron Message-ID: References: <20040227200459.GO3925@squish.home.loc> X-Trace: ncc1701.cistron.net 1077913948 19148 62.216.30.38 (27 Feb 2004 20:32:28 GMT) X-Complaints-To: abuse@cistron.nl X-Newsreader: trn 4.0-test76 (Apr 2, 2001) Originator: dth@ncc1701.cistron.net (Danny ter Haar) To: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Paul wrote: >By default, my hdparm numbers and my kernel build time >benchmark were worse on all 2.6 vs. 2.4 kernels, until I tried: >/sbin/hdparm -a 4096 /dev/hdx >eg. (typical averages) >2.4.21: >Timing buffered disk reads: 80 MB in 3.07 seconds = 26.06 MB/sec >2.6.0-test5: >Timing buffered disk reads: 68 MB in 3.06 seconds = 22.21 MB/sec >2.6.1: [readahead 4096] >Timing buffered disk reads: 90 MB in 3.02 seconds = 29.82 MB/sec Allready thought about that, tried that but no real difference:belfish:~# uname -a Linux babelfish 2.6.3-mm4 #3 Fri Feb 27 14:09:38 CET 2004 i686 GNU/Linux babelfish:~# /sbin/hdparm -a 4096 /dev/hda /dev/hda: setting fs readahead to 4096 readahead = 4096 (on) babelfish:~# hdparm -t /dev/hda Timing buffered disk reads: 110 MB in 3.02 seconds = 36.47 MB/sec I just installed a news amd64 en few 19" servers. But none of them showed downgrade in performance when i upped the kernel. Possibilities left (according to me!) - scheduler (should i try different setup ?) - irq problems (in combination with acpi?) i booted with acpi=off and retested but same results. - driver, specific the via-onboard. No luck so far! Danny -- /"\ | Dying is to be avoided because \ / ASCII RIBBON CAMPAIGN | it can ruin your whole career X against HTML MAIL | / \ and POSTINGS | - Bob Hope