Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261915AbVCUWJl (ORCPT ); Mon, 21 Mar 2005 17:09:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261930AbVCUWJl (ORCPT ); Mon, 21 Mar 2005 17:09:41 -0500 Received: from fire.osdl.org ([65.172.181.4]:54974 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S261915AbVCUWJj (ORCPT ); Mon, 21 Mar 2005 17:09:39 -0500 Date: Mon, 21 Mar 2005 14:09:42 -0800 From: Andrew Morton To: "Miquel van Smoorenburg" Cc: linux-kernel@vger.kernel.org Subject: Re: 2.6.11: iostat values broken ? Message-Id: <20050321140942.344fff89.akpm@osdl.org> In-Reply-To: References: X-Mailer: Sylpheed version 1.0.0 (GTK+ 1.2.10; i386-vine-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 Content-Length: 1655 Lines: 29 "Miquel van Smoorenburg" wrote: > > I just upgrades one of our newsservers from 2.6.9 to 2.6.11. I > use "iostat -k -x 2" to see live how busy the disks are. But > I don't believe that Linux optimizes things so much that a disk > can be 1849.55% busy :) > > (you'll have to stretch out your xterm to be able to read this): > > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util > hda 0.00 50.00 0.00 18.18 0.00 545.45 0.00 272.73 30.00 2.35 129.00 86.25 156.82 > hdc 0.00 45.45 77.27 31.82 3927.27 618.18 1963.64 309.09 41.67 6.27 57.42 38.42 419.09 > hdd 4.55 0.00 63.64 0.00 68.18 0.00 34.09 0.00 1.07 1.11 17.43 17.43 110.91 > hde 477.27 0.00 45.45 0.00 522.73 0.00 261.36 0.00 11.50 0.40 8.90 8.90 40.45 > hdg 18.18 70154.55 22.73 172.73 40.91 70727.27 20.45 35363.64 362.07 1010.36 1127.72 94.63 1849.55 > > With 2.6.9, %util never came above 100% (and that was indeed "fully loaded". > I have systems with a comparable load running 2.6.10 and 2.6.11-rc3-bk4 > that also don't show this behaviour (but those are SCSI, not IDE). > > I use CFQ, but changing that to deadline doesn't make a difference. > Mike, did you ever get to the bottom of this? Still happening in 2.6.12-rc1? - 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/