Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759051AbZDFWPk (ORCPT ); Mon, 6 Apr 2009 18:15:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754863AbZDFWPa (ORCPT ); Mon, 6 Apr 2009 18:15:30 -0400 Received: from mga03.intel.com ([143.182.124.21]:4450 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754419AbZDFWPa (ORCPT ); Mon, 6 Apr 2009 18:15:30 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.39,332,1235980800"; d="scan'208";a="128511674" Date: Tue, 7 Apr 2009 06:15:09 +0800 From: Wu Fengguang To: "Rafael J. Wysocki" Cc: Linux Kernel Mailing List , Kernel Testers List , Andrew Morton , "Lin, Ming M" , Linus Torvalds , Nick Piggin , Peter Zijlstra Subject: Re: [Bug #12809] iozone regression with 2.6.29-rc6 Message-ID: <20090406221509.GA17604@localhost> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1511 Lines: 37 On Tue, Apr 07, 2009 at 03:05:38AM +0800, Rafael J. Wysocki wrote: > This message has been generated automatically as a part of a report > of recent regressions. > > The following bug entry is on the current list of known regressions > from 2.6.28. Please verify if it still should be listed and let me know > (either way). > > > 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. 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..) Thanks, Fengguang -- 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/