linux-kernel - Re: [Bug #14141] order 2 page allocation failures in iwlagn

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Message-Id: <200910150402.03953.elendil@planet.nl>
Date:	Thu, 15 Oct 2009 04:02:00 +0200
From:	Frans Pop <elendil@...net.nl>
To:	reinette chatre <reinette.chatre@...el.com>
Cc:	Mel Gorman <mel@....ul.ie>, David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	"Abbas, Mohamed" <mohamed.abbas@...el.com>,
	"John W. Linville" <linville@...driver.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [Bug #14141] order 2 page allocation failures in iwlagn

On Wednesday 14 October 2009, reinette chatre wrote:
> We do queue the GFP_KERNEL allocations when there are only a few buffers
> remaining in the queue (8 right now) ... maybe we can make this higher?

I've tried increasing it to 50. Here's the result for a single test:
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 25 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 48 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 48 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 48 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
__ratelimit: 1 callbacks suppressed
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
__ratelimit: 97 callbacks suppressed
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 44 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.

This is with current mainline (v2.6.32-rc4-149-ga3ccf63).

The log file timestamps don't tell much as the logging gets delayed,
so they all end up at the same time. Maybe I should enable the kernel
timestamps so we can see how far apart these failures are.
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