Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 1 Oct 2002 18:32:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 1 Oct 2002 18:19:55 -0400 Received: from [195.39.17.254] ([195.39.17.254]:18180 "EHLO Elf.ucw.cz") by vger.kernel.org with ESMTP id ; Tue, 1 Oct 2002 18:18:27 -0400 Date: Mon, 30 Sep 2002 07:45:20 +0000 From: Pavel Machek To: Jens Axboe Cc: Linux Kernel Subject: Re: [PATCH] deadline io scheduler Message-ID: <20020930074519.B159@toy.ucw.cz> References: <20020925172024.GH15479@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0.1i In-Reply-To: <20020925172024.GH15479@suse.de>; from axboe@suse.de on Wed, Sep 25, 2002 at 07:20:24PM +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1141 Lines: 28 Hi! > Due to recent "problems" (well the vm being just too damn good at keep > disks busy these days), it's become even more apparent that our current > io scheduler just cannot cope with some work loads. Repeated starvartion > of reads is the most important one. The Andrew Morton Interactive > Workload (AMIW) [1] rates the current kernel poorly, on my test machine > it completes in 1-2 minutes depending on your luck. 2.5.38-BK does a lot > better, but mainly because it's being extremely unfair. This deadline io > scheduler finishes the AMIW in anywhere from ~0.5 seconds to ~3-4 > seconds, depending on the io load. would it be possible to make deadlines per-process to introduce ionice? ionice -n -5 mpg123 foo.mp3 ionice make ? Pavel -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/