netdev - Re: [PATCH 3/4 v2 net-next] net: make GRO aware of skb->head

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Message-Id: <20120430.214831.1079448543357914010.davem@davemloft.net>
Date:	Mon, 30 Apr 2012 21:48:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, ncardwell@...gle.com, therbert@...gle.com,
	jeffrey.t.kirsher@...el.com, mchan@...adcom.com,
	mcarlson@...adcom.com, herbert@...dor.hengli.com.au,
	bhutchings@...arflare.com, ilpo.jarvinen@...sinki.fi,
	maze@...gle.com
Subject: Re: [PATCH 3/4 v2 net-next] net: make GRO aware of skb->head_frag

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 30 Apr 2012 20:10:34 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> GRO can check if skb to be merged has its skb->head mapped to a page
> fragment, instead of a kmalloc() area.
> 
> We 'upgrade' skb->head as a fragment in itself
> 
> This avoids the frag_list fallback, and permits to build true GRO skb
> (one sk_buff and up to 16 fragments), using less memory.
> 
> This reduces number of cache misses when user makes its copy, since a
> single sk_buff is fetched.
> 
> This is a followup of patch "net: allow skb->head to be a page fragment"
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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