netdev - Re: [Xen-devel] [PATCHv1 net-next] xen-netback: remove unconditional pull_skb

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Message-ID: <1415137397.25370.7.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 04 Nov 2014 13:43:17 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	zoltan.kiss@...aro.org, david.vrabel@...rix.com,
	Ian.Campbell@...rix.com, netdev@...r.kernel.org,
	malcolm.crossley@...rix.com, wei.liu2@...rix.com,
	xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] [PATCHv1 net-next] xen-netback: remove
 unconditional pull_skb_tail in guest Tx path

On Tue, 2014-11-04 at 16:17 -0500, David Miller wrote:


> 
> Every protocol demux starts with pskb_may_pull() to pull frag data
> into the linear area, if necessary, before looking at headers.

eth_get_headlen() might be relevant as well, to perform a single copy of
exactly all headers.

This is known to help a bit.


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