From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270630AbTG3KzF (ORCPT ); Wed, 30 Jul 2003 06:55:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270648AbTG3KzF (ORCPT ); Wed, 30 Jul 2003 06:55:05 -0400 Received: from fw.osdl.org ([65.172.181.6]:4026 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S270630AbTG3KzC (ORCPT ); Wed, 30 Jul 2003 06:55:02 -0400 Date: Wed, 30 Jul 2003 03:55:24 -0700 From: Andrew Morton To: Stefano Rivoir Cc: lista1@telia.com, linux-kernel@vger.kernel.org Subject: Re: Disk performance degradation Message-Id: <20030730035524.65cfc39a.akpm@osdl.org> In-Reply-To: <3F2786E9.9010808@gts.it> References: <20030729182138.76ff2d96.lista1@telia.com> <3F2786E9.9010808@gts.it> X-Mailer: Sylpheed version 0.9.4 (GTK+ 1.2.10; i686-pc-linux-gnu) 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 Stefano Rivoir wrote: > > Voluspa wrote: > > > On 2003-07-29 12:00:06 Stefano Rivoir wrote: > > > > > >>Is there something I'm missing?! > > > > > > No, you are not ;-) You can reclaim some speed by doing a "hdparm -a > > 512". See thread for explanation (it's the borked value for readahead): > > Thanks for the hint. This seems to make things a little better, but I'm > still far away from 2.4 performances. I thought that anticipatory sched > could be part of the problem, and booting with elevator=deadline > does a little better... but using 2.4 is completely another thing. > By the way, -a 512 vs -a 8 is a kernel "change" or an hdpam one? What makes you think it is a disk performance problem at all? All we know is that KDE applications take longer to start up, yes? How much memory is in that machine? Can you run a `vmstat 1' trace during the "slow" operations?