From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751208AbWFNH7P (ORCPT ); Wed, 14 Jun 2006 03:59:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751241AbWFNH7P (ORCPT ); Wed, 14 Jun 2006 03:59:15 -0400 Received: from cool.dworf.com ([193.189.190.81]:31555 "EHLO cool.dworf.com") by vger.kernel.org with ESMTP id S1751208AbWFNH7O (ORCPT ); Wed, 14 Jun 2006 03:59:14 -0400 Message-ID: <448FC1CE.9090108@dworf.com> Date: Wed, 14 Jun 2006 09:59:10 +0200 From: David Osojnik Reply-To: david@dworf.com User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050716) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: bad command responsiveness Proliant DL 585 X-Enigmail-Version: 0.92.1.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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) we tried raid0, raid1, raid5 its the same and we even tried some other raid controllers other then default onboard Smart Array 5i we tried Smart Array 6402 and MegaRAID SCSI 320-2X. The problem is still there the only difference is writing speed but the lockups are still there! and we tried this on four different DL 585 servers with all the same problem! load when creating 32Gb file was around 10 (starting creation of the file with load 0.05) and the system did not run any services except the default (after a fresh minimum install of more then one distribution) we tried it too with all services shutdown and as much modules unloaded as we could remove. we tried lots of kernels and cciss modules but all have the problem including 2.6.16.20 only the kernel 2.4 was working better there were still the lockups but were less often and commands executed faster around 50%. why am i writing to kernel list because it looks like a kernel problem to me since the kernel 2.4 looks much better. hope someone can help because we are getting really desperate thanks