netdev - Re: [NET][TG3] Fwd: page allocation failure with linux 3.1.1

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Date:	Mon, 28 Nov 2011 20:28:14 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Пламен Петров 
	<plamen.sisi@...il.com>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org
Subject: Re: [NET][TG3] Fwd: page allocation failure with linux 3.1.1

Le lundi 28 novembre 2011 à 11:05 -0800, Rick Jones a écrit :
> On 11/28/2011 12:26 AM, Eric Dumazet wrote:

> > Since some devices might copy skb to a linear one in their
> > ndo_start_xmit(), we could set a netdev limit so that TSO can still be
> > used on these devices, but limiting number of frags to
> > 2^PAGE_ALLOC_COSTLY_ORDER
> 
> How much "TSO value" remains after such a copy?

Instead of filling up to 64Kbytes + one head of data per skb, we'll fill
32kbytes (8*4Kbytes) + one head.

Thats still better than 1460 bytes per skb :)



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