From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752532Ab1HSAUf (ORCPT ); Thu, 18 Aug 2011 20:20:35 -0400 Received: from mga11.intel.com ([192.55.52.93]:20785 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751458Ab1HSAUe (ORCPT ); Thu, 18 Aug 2011 20:20:34 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.68,248,1312182000"; d="scan'208";a="42870917" Subject: Re: cfq-iosched: a regression From: Shaohua Li To: Justin TerAvest Cc: Jens Axboe , lkml , "Shi, Alex" In-Reply-To: References: <1313462826.27321.22.camel@sli10-conroe> Content-Type: text/plain; charset="UTF-8" Date: Fri, 19 Aug 2011 08:21:35 +0800 Message-ID: <1313713295.29510.1.camel@sli10-conroe> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2011-08-19 at 04:22 +0800, Justin TerAvest wrote: > Hi Shaohua, > > What was the workload you were running to find this regression? kernel build as I declared below. Thanks, Shaohua > On Mon, Aug 15, 2011 at 7:47 PM, Shaohua Li wrote: > > We have a kernel build regression since 3.1-rc1, which is about 10% > > regression. The kernel source is in an ext3 filesystem. > > Alex Shi bisect it to commit: > > commit a07405b7802691d29ab3b23bdc76ee6d006aad0b > > Author: Justin TerAvest > > Date: Sun Jul 10 22:09:19 2011 +0200 > > > > cfq: Remove special treatment for metadata rqs. > > > > Apparently this is caused by lack metadata preemption, where ext3/ext4 > > do use READ_META. I didn't see a way to fix the issue, so suggest > > reverting the patch. > > > > Reported-by: Alex Shi > > Reported-by: Shaohua Li > > > >