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

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@...iker.ch ++41 62 775 9902 / sb: -9900
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