From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267689AbUHMXSj (ORCPT ); Fri, 13 Aug 2004 19:18:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267726AbUHMXSj (ORCPT ); Fri, 13 Aug 2004 19:18:39 -0400 Received: from the-village.bc.nu ([81.2.110.252]:57050 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S267689AbUHMXSZ (ORCPT ); Fri, 13 Aug 2004 19:18:25 -0400 Subject: Re: High CPU usage (up to server hang) under heavy I/O load From: Alan Cox To: Sylvain COUTANT Cc: Linux Kernel Mailing List In-Reply-To: <20040813140229.4F48B2FC2C@illicom.com> References: <20040813140229.4F48B2FC2C@illicom.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1092435364.24960.35.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Fri, 13 Aug 2004 23:16:05 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Gwe, 2004-08-13 at 15:01, Sylvain COUTANT wrote: > I have a problem with one server (DELL, 1 TB RAID5 + RAID0, Bi-Xeon, 8 GB > RAM) which, sometimes, goes mad when the I/O pressure gets too high. We use > this server as a VMWare server and as a backup server (200 GB are dedicated > to the backup part). We have run full hardware diags and checked every > software that runs on the system. We have been able to reproduce the problem > once without having launched the VMWare server (so I believe this software > is not responsible for the problem). > > We have tested kernels 2.4.22 and 2.4.26. The server is running under Debian > Woody. Is your raid controller 64bit capable ? If you can I'd also go to a 2.6 kernel for anything > 1Gb, and definitely > 4Gb of RAM. The differences are astounding although if your PCI I/O hardware cant do 64bit access your box will suck whatever kernel 8)