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

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Message-ID: <1349369406.16011.82.camel@edumazet-glaptop>
Date:	Thu, 04 Oct 2012 18:50:06 +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 18:02 +0200, Maxime Bizon wrote:
> O
> 
> Since skb_recycle() resets skb->data using (skb->head + NET_SKB_PAD), a
> recycled skb going multiple times through a path that needs to expand
> skb head will get bigger and bigger each time, and you eventually end up
> with an allocation failure.
> 

Because there is not enough headroom ?

> An idea to fix this would be to pass needed skb size to skb_resize() and
> set skb->data to MIN(NET_SKB_PAD, (skb->end - skb->head - skb_size) / 2)

I am trying to decode this but I cant ;)

What is skb_resize() ?
and what do you mean setting skb->data to MIN(NET_SKB_PAD, (skb->end -
skb->head - skb_size) / 2)

Care to explain again your idea ?

Thanks !



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