From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751380AbWD1UpK (ORCPT ); Fri, 28 Apr 2006 16:45:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751450AbWD1UpK (ORCPT ); Fri, 28 Apr 2006 16:45:10 -0400 Received: from fmmailgate04.web.de ([217.72.192.242]:28391 "EHLO fmmailgate04.web.de") by vger.kernel.org with ESMTP id S1751380AbWD1UpI (ORCPT ); Fri, 28 Apr 2006 16:45:08 -0400 Date: Fri, 28 Apr 2006 22:45:06 +0200 Message-Id: <1092993727@web.de> MIME-Version: 1.0 From: devzero@web.de To: linux-kernel@vger.kernel.org Subject: Linux I/O scheduling - ionice & co Organization: http://freemail.web.de/ Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello experts! Whenever I do large file operations on my VMware GSX Server (copying/backup operations on the HOST), all the VMs become dead slow, regardless what elevator i select at boot time. what can I do that dedicated processes get higher preference regarding I/O ? from this list i found, that in recent kernels we have cfq/ionice for this. is this rated "stable" and does it already work well? maybe there are alternative approaches for this? let me give another example: if i start an I/O hog like "dd if=/dev/zero of=test.dat" the whole interactivity of a linux system is being influenced very negatively. i have found that working on a system running an I/O hog often becomes a real pain. if i start an CPU hog or syscall hog like "while true;do true;done" or "while /bin/true;do /bin/true;done" this never has such bad effects than starting an I/O hog. is it possible to adress this by some more "fine-tuning" or is this just because of the "nature" of I/O scheduling ? i would be happy if somebody could give a comment or share his experience about this. TIA roland k. systems engineer ps: no comment about the behaviour of a windows system which is under high I/O load..... ;) _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192