From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272243AbTG3VDF (ORCPT ); Wed, 30 Jul 2003 17:03:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S272249AbTG3VDF (ORCPT ); Wed, 30 Jul 2003 17:03:05 -0400 Received: from windsormachine.com ([206.48.122.28]:49424 "EHLO router.windsormachine.com") by vger.kernel.org with ESMTP id S272243AbTG3VC7 (ORCPT ); Wed, 30 Jul 2003 17:02:59 -0400 Date: Wed, 30 Jul 2003 17:02:47 -0400 (EDT) From: Mike Dresser To: linux-kernel@vger.kernel.org Subject: Re: Disk performance degradation In-Reply-To: <3F26A5E2.4070701@aros.net> Message-ID: References: <20030729182138.76ff2d96.lista1@telia.com> <3F26A5E2.4070701@aros.net> 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 On Tue, 29 Jul 2003, Lou Langholtz wrote: > Anyone want to field why we aren't we just setting the default to 512 so > users don't need to adjust this? I'm sure there's a good reason... I'd > just like to know what it is ;-) mike:~# hdparm -a 512 /dev/hda /dev/hda: setting fs readahead to 512 BLKRASET failed: Invalid argument readahead = 8 (on) mike:~# hdparm -a 255 /dev/hda /dev/hda: setting fs readahead to 255 readahead = 255 (on) mike:~# hdparm -a 256 /dev/hda /dev/hda: setting fs readahead to 256 BLKRASET failed: Invalid argument readahead = 255 (on) Probably for reasons like that. For some reason, I can't set my ICH4 based controller(ASUS P4B533) and Quantum Fireball AS40.0 to more than 255. Kernel is 2.4.21 Or I'm missing more of this thread than I thought and I'm completely off topic here! (i'm guessing the latter) Mike