Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756604AbZCOAbq (ORCPT ); Sat, 14 Mar 2009 20:31:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755731AbZCOAbf (ORCPT ); Sat, 14 Mar 2009 20:31:35 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:57709 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755348AbZCOAbe (ORCPT ); Sat, 14 Mar 2009 20:31:34 -0400 Date: Sat, 14 Mar 2009 17:27:08 -0700 (PDT) From: Linus Torvalds X-X-Sender: torvalds@localhost.localdomain To: "Rafael J. Wysocki" cc: Linux Kernel Mailing List , Kernel Testers List , Andrew Morton , Lin Ming , Nick Piggin , Peter Zijlstra , Wu Fengguang Subject: Re: [Bug #12809] iozone regression with 2.6.29-rc6 In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1566 Lines: 37 On Sat, 14 Mar 2009, Rafael J. Wysocki wrote: > > 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 (16 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 > Handled-By : Wu Fengguang I suspect that I should just raise the default dirty limits. Wu reported that it fixed the regression, and while he picked some rather high percentages, I think we could certainly raise the rather aggressive default ones. After all, those default percentages were picked (a) with the old dirty logic and (b) largely at random and (c) designed to be aggressive. In particular, that (a) means that having fixed some of the dirty accounting, maybe the real bug is now that it was always too aggressive, just hidden by an accounting issue. If we raised the default ratio from 5/10 to 10/20, what happens to the iozone regression? Linus -- 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/