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Date: Sat, 26 Jul 2008 06:13:52 +0900
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Udo van den Heuvel <udovdh@xs4all.nl>
Subject: Re: What to do with `kswapd0: page allocation failure. ` ?
Cc: kosaki.motohiro@jp.fujitsu.com, LKML <linux-kernel@vger.kernel.org>
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> 
> Hello,
> 
> Found a few of these logged. See below.
> What are they? Harmfull? Bug?

no bug.
this stack trace speak to

1. memory pressure increased
2. kswapd ran
3. network packet received
4. interrupt for network happend
5. but can't allocate memory for network buffer(skb).
6. Then, packet dropped
7. Then, warning happend.

your network peer may resend the same packet after few times.
no problem.