From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272313AbTHRTtW (ORCPT ); Mon, 18 Aug 2003 15:49:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S272445AbTHRTtV (ORCPT ); Mon, 18 Aug 2003 15:49:21 -0400 Received: from mail.cid.net ([193.41.144.34]:52902 "EHLO mail.cid.net") by vger.kernel.org with ESMTP id S272313AbTHRTtU (ORCPT ); Mon, 18 Aug 2003 15:49:20 -0400 Date: Mon, 18 Aug 2003 21:49:02 +0200 From: Stefan Foerster To: "Justin T. Gibbs" Cc: linux-kernel@vger.kernel.org Subject: Re: Very bad interactivity with 2.6.0 and SCSI disks (aic7xxx) Message-ID: <20030818194902.GB1589@in-ws-001.cid-net.de> References: <20030818013243.GB21665@in-ws-001.cid-net.de> <1294265408.1061233452@aslan.btc.adaptec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1294265408.1061233452@aslan.btc.adaptec.com> X-Now-Playing: Sting - Desert Rose User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * "Justin T. Gibbs" wrote: >> But as soon as I do a >> >> while true; do dd if=/dev/zero of=test bs=1024 count=1048576 ; rm test >> ; done >> >> on my SCSI disk, the system becomes completely unusuable after a few >> seconds. Everything is running at the speed of molasses, even screen >> redrawing, the music stops playing for some seconds, my mouse hangs >> and so on. > > It sounds like the system is not limiting the rate at which an I/O > hog can dirty pages, so this one process ends up consuming all of > your I/O bandwidth. Well, this is not the desired behaviour, at least not for me. Any ideas what I could do to solve this problem? I sent an oprofile output to lkml, perhaps that helps? I am more than willing to give every information needed to debug this problem, because this bad interactive behaviuor is really annoying. Is there a slight possibility that this problem is not specific to 2.5/2.6, because I encounter similar problems on 2.4? Ciao, Stefan -- Stefan Förster Public Key: 0xBBE2A9E9 FdI #192: Strong international Encryption - Triple-ROT13 (Carsten Lechte)