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Date: Mon, 14 Dec 2009 06:59:08 +0100 (CET)
From: Tobias Oetiker <tobi@oetiker.ch>
Subject: Re: still getting allocation failures (was Re: [PATCH] vmscan: Stop
 kswapd waiting on congestion when the min watermark is not being met V2)
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To: Corrado Zoccolo <czoccolo@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>, Andrew Morton <akpm@linux-foundation.org>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Frans Pop <elendil@planet.nl>, Jiri Kosina <jkosina@suse.cz>, Sven Geggus <lists@fuchsschwanzdomain.de>, Karol Lewandowski <karol.k.lewandowski@gmail.com>, linux-kernel@vger.kernel.org, "linux-mm@kvack.org" <linux-mm@kvack.org>, Pekka Enberg <penberg@cs.helsinki.fi>, Rik van Riel <riel@redhat.com>, Christoph Lameter <cl@linux-foundation.org>, Stephan von Krawczynski <skraw@ithnet.com>, "Rafael J. Wysocki" <rjw@sisk.pl>, Kernel Testers List <kernel-testers@vger.kernel.org>
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Hi Corrado,

Dec 3 Corrado Zoccolo wrote:

> Hi Tobias,
> does the patch in http://lkml.org/lkml/2009/11/30/301 help with your
> high order allocation problems?
> It seems that you have lot of memory, but high order pages do not show up.
> The patch should make them more likely to appear.
> On my machine (that has much less ram than yours), with the patch, I
> always have order-10 pages available.

I have tried it and ... it does not work, the  page allocation
failure still shows. BUT while testing it on two machines I found that it
only shows on on machine. The workload on the two machines is
similar (they both run virtualbox) and also the available memory.

Could it be caused by a hardware driver ?

cheers
tobi

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi@oetiker.ch ++41 62 775 9902 / sb: -9900

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