Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755529AbZDFXgV (ORCPT ); Mon, 6 Apr 2009 19:36:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751695AbZDFXgF (ORCPT ); Mon, 6 Apr 2009 19:36:05 -0400 Received: from hera.kernel.org ([140.211.167.34]:53592 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751268AbZDFXgD (ORCPT ); Mon, 6 Apr 2009 19:36:03 -0400 Date: Mon, 6 Apr 2009 23:34:20 +0000 From: Chris Wright To: "Rafael J. Wysocki" Cc: Wu Fengguang , Nick Piggin , Peter Zijlstra , "Lin, Ming M" , Linux Kernel Mailing List , Andrew Morton , Kernel Testers List , Linus Torvalds , stable@kernel.org Subject: Re: [stable] [Bug #12809] iozone regression with 2.6.29-rc6 Message-ID: <20090406233420.GA17070@hera.kernel.org> References: <20090406221509.GA17604@localhost> <20090406222037.GA18714@localhost> <200904070030.26367.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200904070030.26367.rjw@sisk.pl> User-Agent: Mutt/1.5.18 (2008-05-17) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Mon, 06 Apr 2009 23:34:23 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1797 Lines: 39 * Rafael J. Wysocki (rjw@sisk.pl) wrote: > On Tuesday 07 April 2009, Wu Fengguang wrote: > > On Tue, Apr 07, 2009 at 06:15:09AM +0800, Wu Fengguang wrote: > > > On Tue, Apr 07, 2009 at 03:05:38AM +0800, Rafael J. Wysocki wrote: > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12809 > > > > Subject : iozone regression with 2.6.29-rc6 > > > > Submitter : Lin Ming > > > > Date : 2009-02-27 9:13 (39 days old) > > > > First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1cf6e7d83bf334cc5916137862c920a97aabc018 > > > > References : http://marc.info/?l=linux-kernel&m=123572630504360&w=4 > > > > http://lkml.org/lkml/2009/3/14/265 > > > > Handled-By : Wu Fengguang > > > > > > This bug could be closed. > > > > > > The performance regression is triggered by commit 1cf6e7d83bf3(mm: > > > task dirty accounting fix). Which has been reverted in 2.6.29. > > > > Sorry for the mistake, commit 1cf6e7d83bf3 was _not_ reverted. > > So 2.6.29 is expected to have this regression.. > > Added -stable to the CC list. I'm not sure if that was included into .29.1. 1cf6e7d83bf3 is part of 2.6.29.1 (came in 2.6.29-rc6) > > > For 2.6.30, commit 1cf6e7d83bf33(mm: task dirty accounting fix) and > > > 1b5e62b42b55(writeback: double the dirty thresholds) were just merged > > > together. The latter one restores the iozone performance. (However > > > might deteriorate some writeback slowness bugs..) 1b5e62b42b55 is not in -stable. thanks, -chris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/