linux-kernel - Re: iwlagn: order 2 page allocation failures

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Message-Id: <1252617290.30150.321.camel@rc-desk>
Date:	Thu, 10 Sep 2009 14:14:50 -0700
From:	reinette chatre <reinette.chatre@...el.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Frans Pop <elendil@...net.nl>,
	Larry Finger <Larry.Finger@...inger.net>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"cl@...ux-foundation.org" <cl@...ux-foundation.org>,
	"Krauss, Assaf" <assaf.krauss@...el.com>,
	Johannes Berg <johannes@...solutions.net>,
	"Abbas, Mohamed" <mohamed.abbas@...el.com>
Subject: Re: iwlagn: order 2 page allocation failures

On Thu, 2009-09-10 at 02:02 -0700, Mel Gorman wrote:

> 
> As a total aside, there is still the problem that the driver is depending on
> order-2 allocations. On systems without swap, the allocation problem could be
> more severe as there are fewer pages the system can use to regain contiguity.

I looked more at the implementation and hardware interface but I do not
see a way around this. We have to provide 8k buffer to device, and we
have to make sure it is aligned. 

Do you have any suggestions?

Reinette

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