netdev - Re: kernel 3.2.27 on arm: WARNING: at mm/page_alloc.c:2109 __alloc_pages

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Message-ID: <1349371049.16011.90.camel@edumazet-glaptop>
Date:	Thu, 04 Oct 2012 19:17:29 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	mbizon@...ebox.fr
Cc:	David Madore <david+ml@...ore.org>,
	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>
Subject: Re: kernel 3.2.27 on arm: WARNING: at mm/page_alloc.c:2109
 __alloc_pages_nodemask+0x1d4/0x68c()

On Thu, 2012-10-04 at 19:09 +0200, Maxime Bizon wrote:

> yes, on ipv6 forward path the default NET_SKB_PAD is too small, so each
> packet forwarded has its headroom expanded, it is then recycled and gets
> its original default headroom back, then it gets forwarded,
> expanded, ...

Hmm, this sounds bad (especially without recycle)

Might I assume NET_SKB_PAD is 32 on this arch ?

We might adjust NET_SKB_PAD to avoid all these memory copies...


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