From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272267AbTHRTCy (ORCPT ); Mon, 18 Aug 2003 15:02:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S272242AbTHRTCx (ORCPT ); Mon, 18 Aug 2003 15:02:53 -0400 Received: from [216.52.22.10] ([216.52.22.10]:16617 "EHLO magic.adaptec.com") by vger.kernel.org with ESMTP id S272231AbTHRTCv (ORCPT ); Mon, 18 Aug 2003 15:02:51 -0400 Date: Mon, 18 Aug 2003 13:04:12 -0600 From: "Justin T. Gibbs" Reply-To: "Justin T. Gibbs" To: Stefan Foerster , linux-kernel@vger.kernel.org Subject: Re: Very bad interactivity with 2.6.0 and SCSI disks (aic7xxx) Message-ID: <1294265408.1061233452@aslan.btc.adaptec.com> In-Reply-To: <20030818013243.GB21665@in-ws-001.cid-net.de> References: <20030818013243.GB21665@in-ws-001.cid-net.de> X-Mailer: Mulberry/3.1.0b5 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > 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. -- Justin