linux-kernel - Re: [Bug #14141] order 2 page allocation failures (generic)

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Date:	Tue, 20 Oct 2009 13:51:39 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Tobias Oetiker <tobi@...iker.ch>
Cc:	Frans Pop <elendil@...net.nl>,
	Pekka Enberg <penberg@...helsinki.fi>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	"John W. Linville" <linville@...driver.com>, linux-mm@...ck.org,
	jens.axboe@...cle.com
Subject: Re: [Bug #14141] order 2 page allocation failures (generic)

On Tue, Oct 20, 2009 at 01:44:50PM +0200, Tobias Oetiker wrote:
> Hi Mel,
> 
> Today Mel Gorman wrote:
> 
> > On Mon, Oct 19, 2009 at 10:17:06PM +0200, Tobias Oetiker wrote:
> 
> > > Oct 19 22:09:52 johan kernel: [11157.121600]  [<ffffffff813ebd42>] skb_copy+0x32/0xa0 [kern.warning]
> > > Oct 19 22:09:52 johan kernel: [11157.121615]  [<ffffffffa07dd33c>] vboxNetFltLinuxPacketHandler+0x5c/0xd0 [vboxnetflt] [kern.warning]
> > > Oct 19 22:09:52 johan kernel: [11157.121620]  [<ffffffff813f2512>] dev_hard_start_xmit+0x142/0x320 [kern.warning]
> >
> > Are the number of failures at least reduced or are they occuring at the
> > same rate?
> 
> not that it would have any statistical significance, but I had 5
> failure (clusters) yesterday morning and 5 this morning ...
> 

Before the patches were applied, how many failures were you seeing in
the morning?

> the failures often show up in groups I saved one on
> http://tobi.oetiker.ch/cluster-2009-10-20-08-31.txt
> 
> > Also, what was the last kernel that worked for you with this
> > configuration?
> 
> that would be 2.6.24 ... I have not upgraded in quite some time.
> But since the io performance of 2.6.31 is about double in my tests
> I thought it would be a good thing todo ...
> 

That significant a different in performance may explain differences in timing
as well. i.e. the allocator is being put under more pressure now than it
was previously as more processes make forward progress.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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