linux-kernel - Re: GFP_ATOMIC page allocation failures.

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Date:	Wed, 02 Apr 2008 12:12:06 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	"David Miller" <davem@...emloft.net>, mcarlson@...adcom.com
cc:	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	csnook@...hat.com, davej@...emonkey.org.uk,
	nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: GFP_ATOMIC page allocation failures.

On Wed, 2008-04-02 at 11:44 -0700, David Miller wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Date: Wed, 02 Apr 2008 19:56:05 +0900
>
> > BTW:
> > other person's tg3 allocation failure bug report.
> > 
> > http://bugzilla.kernel.org/show_bug.cgi?id=9771
> 
> Yes, I know about it.  It will occur for any device
> which must use linear RX buffers and supports
> >PAGE_SIZE MTUs.
> 
> But modern chips are going to support segmentation of
> receive packets into multiple individual pages and
> therefore not have this order>0 page allocation
> requirement.

tg3 hardware has a jumbo rx ring that can accommodate non-linear SKBs.
Matt is working on some patches to add this feature.

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