netdev - Re: [PATCH v12 06/17] Use callback to deal with skb_release

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Message-ID: <1286811731.2737.28.camel@edumazet-laptop>
Date:	Mon, 11 Oct 2010 17:42:11 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	xiaohui.xin@...el.com, netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	herbert@...dor.apana.org.au, jdike@...ux.intel.com
Subject: Re: [PATCH v12 06/17] Use callback to deal with skb_release_data()
 specially.

Le lundi 11 octobre 2010 à 08:27 -0700, David Miller a écrit :
> From: "Xin, Xiaohui" <xiaohui.xin@...el.com>
> Date: Mon, 11 Oct 2010 15:06:05 +0800
> 
> > That's to avoid the new cache miss caused by using destructor_arg in data path
> > like skb_release_data().
> > That's based on the comment from Eric Dumazet on v7 patches.
> 
> Thanks for the explanation.

Anyway, frags[] must be the last field of "struct skb_shared_info"
since commit fed66381 (net: pskb_expand_head() optimization)

It seems Xin worked on a quite old tree.



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