Subject: Re: iwlagn: order 2 page allocation failures
From: reinette chatre <reinette.chatre@intel.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Frans Pop <elendil@planet.nl>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	"John W. Linville" <linville@tuxdriver.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
	"ipw3945-devel@lists.sourceforge.net"
	<ipw3945-devel@lists.sourceforge.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	"cl@linux-foundation.org" <cl@linux-foundation.org>,
	"Krauss, Assaf" <assaf.krauss@intel.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	"Abbas, Mohamed" <mohamed.abbas@intel.com>
In-Reply-To: <20090910090206.GA22276@csn.ul.ie>
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Date: Thu, 10 Sep 2009 14:14:50 -0700
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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