From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932225AbWFNJjH (ORCPT ); Wed, 14 Jun 2006 05:39:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932236AbWFNJjH (ORCPT ); Wed, 14 Jun 2006 05:39:07 -0400 Received: from mail.gmx.net ([213.165.64.21]:6329 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S932225AbWFNJjF (ORCPT ); Wed, 14 Jun 2006 05:39:05 -0400 X-Authenticated: #14349625 Subject: Re: bad command responsiveness Proliant DL 585 From: Mike Galbraith To: david@dworf.com Cc: linux-kernel@vger.kernel.org In-Reply-To: <448FC1CE.9090108@dworf.com> References: <448FC1CE.9090108@dworf.com> Content-Type: text/plain Date: Wed, 14 Jun 2006 11:42:41 +0200 Message-Id: <1150278161.7994.13.camel@Homer.TheSimpsons.net> Mime-Version: 1.0 X-Mailer: Evolution 2.4.0 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2006-06-14 at 09:59 +0200, David Osojnik wrote: > Hello, > > We have a problem with four HP Proliant DL 585 servers with 4 AMD > Opteron processors and 16Gb of memory and 3x 300Gb U320 SCSI disks and > with all the latest firmware. we noticed bad command responsiveness in > an production environment and poor performance (web server and mysql) > The problem is good reproducible if creating a large file 30Gb in size with: > > time dd if=/dev/zero of=test.file bs=3072 count=10240000 > > on the root partition no matter which one reiserfs, ext3 > > what happens is I open three more console windows and do random commands > like: "ls, w, route -n, ifconfig" but the commands freezes for random > time (this time is from 1 minute to 15minutes!! per command execution > time) when the command starts working (after 5minutes) i try it again > and the command freezes again for a random time... the strange thing is > that if one command freezes all other commands freeze too when one > starts to work others work too. (if running top it stops refreshing for > the lockup period) Does top freeze if started from an mlockall(MCL_PRESENT|MCL_FUTURE) shell running at realtime priority? Try SysRq-T and SysRq-M during freezes to gather info about VM and task state during freeze. -Mike