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Subject: Re: [Bug #14141] order 2 page allocation failures in iwlagn
From: reinette chatre <reinette.chatre@intel.com>
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Date: Fri, 16 Oct 2009 22:42:23 -0700
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To: Frans Pop <elendil@planet.nl>
Cc: Mel Gorman <mel@csn.ul.ie>, David Rientjes <rientjes@google.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, "Rafael J. Wysocki" <rjw@sisk.pl>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Kernel Testers List <kernel-testers@vger.kernel.org>, Pekka Enberg <penberg@cs.helsinki.fi>, Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>, Karol Lewandowski <karol.k.lewandowski@gmail.com>, "Abbas, Mohamed" <mohamed.abbas@intel.com>, "John W. Linville" <linville@tuxdriver.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>
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Hi Frans,

On Thu, 2009-10-15 at 12:41 -0700, Frans Pop wrote:
> On Thursday 15 October 2009, reinette chatre wrote:
> > > The log file timestamps don't tell much as the logging gets delayed,
> > > so they all end up at the same time. Maybe I should enable the kernel
> > > timestamps so we can see how far apart these failures are.
> >
> > If you can get accurate timing it will be very useful. I am interested
> > to see how quickly it goes from "48 free buffers" to "0 free buffers".
> 
> Attached the dmesg for three consecutive test runs (i.e. without 
> rebooting). Not that the 2nd one includes only "0 free buffers" messages, 
> even though the behavior (point where desktop freezes and music stops) 
> looked similar.
> 
> Not sure if you can tell all that much from the data.
> 

Prompted by this thread we are in process of moving allocation to paged
skb. This will definitely reduce the allocation size (from order 2 to
order 1) and hopefully help with this problem also. Could you please try
with the attached two patches? They are based on 2.6.32-rc4.

Thank you very much

Reinette






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