From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752573AbXDQIN2 (ORCPT ); Tue, 17 Apr 2007 04:13:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752654AbXDQIN2 (ORCPT ); Tue, 17 Apr 2007 04:13:28 -0400 Received: from wasp.net.au ([203.190.192.17]:33878 "EHLO wasp.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752573AbXDQIN0 (ORCPT ); Tue, 17 Apr 2007 04:13:26 -0400 Message-ID: <462481A0.4060707@wasp.net.au> Date: Tue, 17 Apr 2007 12:13:20 +0400 From: Brad Campbell User-Agent: Thunderbird 1.5.0.10 (X11/20070306) MIME-Version: 1.0 To: Neil Brown CC: Chuck Ebbert , Jens Axboe , lkml Subject: Re: [OOPS] 2.6.21-rc6-git5 in cfq_dispatch_insert References: <4621FAF0.7000705@wasp.net.au> <46220339.9080205@wasp.net.au> <4623FB29.1000603@redhat.com> <17956.22235.574867.179016@notabene.brown> In-Reply-To: <17956.22235.574867.179016@notabene.brown> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Neil Brown wrote: > On Monday April 16, cebbert@redhat.com wrote: >> cfq_dispatch_insert() was called with rq == 0. This one is getting really >> annoying... and md is involved again (RAID0 this time.) > > Yeah... weird. > RAID0 is so light-weight and so different from RAID1 or RAID5 that I > feel fairly safe concluding that the problem isn't in or near md. > But that doesn't help you. It's raid-5 here and it was degraded. I've just added the extra disk now and I've been running with the deadline scheduler to work around the issue. I'll add Neil's patch and try some tests with cfq tonight if I get the chance. Brad -- "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so." -- Douglas Adams