From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266561AbUHOJMF (ORCPT ); Sun, 15 Aug 2004 05:12:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266565AbUHOJMF (ORCPT ); Sun, 15 Aug 2004 05:12:05 -0400 Received: from tristate.vision.ee ([194.204.30.144]:58591 "HELO mail.city.ee") by vger.kernel.org with SMTP id S266561AbUHOJMC (ORCPT ); Sun, 15 Aug 2004 05:12:02 -0400 Message-ID: <411F28D6.9000005@vision.ee> Date: Sun, 15 Aug 2004 12:11:50 +0300 From: =?UTF-8?B?TGVuYXIgTMO1aG11cw==?= Organization: Vision User-Agent: Mozilla Thunderbird 0.7.3 (X11/20040805) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Tom Sightler Cc: Sylvain COUTANT , "'Matt Domsch'" , Linux-Kernel Subject: Re: High CPU usage (up to server hang) under heavy I/O load References: <20040813154737.7DCC12FC2C@illicom.com> <1092454748.3816.11.camel@localhost.localdomain> In-Reply-To: <1092454748.3816.11.camel@localhost.localdomain> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Tom Sightler wrote: >On Fri, 2004-08-13 at 11:46, Sylvain COUTANT wrote: > > >During heavy writes to the drives attached to the PERC4/Di the system >becomes practically unusable. I've been wanting to try the 'megaraid2' >driver to see if this gets rid of the issue but I haven't been able to >try that yet. > > Can confirm same symptoms. But I can say that megaraid2 driver gets rid of this slowdown (during heavy writing). Only problem you can't use dellmgr or megamon with this driver it seems. >We have some older systems with PERC2/DC cards which also use the >'megaraid' driver but they don't seem to experience this issue so I'm a >little suspicious that perhaps this driver simply doesn't work that well >with the newer megaraid-like controllers. > > It's PERC3/QC here. Lenar