linux-kernel - Re: [Bug #12809] iozone regression with 2.6.29-rc6

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Message-Id: <200904070030.26367.rjw@sisk.pl>
Date:	Tue, 7 Apr 2009 00:30:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Lin, Ming M" <ming.m.lin@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, stable@...nel.org
Subject: Re: [Bug #12809] iozone regression with 2.6.29-rc6

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:
> > > 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 <ming.m.lin@...el.com>
> > > 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 <fengguang.wu@...el.com>
> > > 
> > 
> > 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.

> > 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, I've closed the bug.

Rafael
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