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

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Date:	Wed, 02 May 2012 18:27:51 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Tom Herbert <therbert@...gle.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Michael Chan <mchan@...adcom.com>,
	Matt Carlson <mcarlson@...adcom.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Maciej Żenczykowski <maze@...gle.com>
Subject: Re: [PATCH 3/4 v2 net-next] net: make GRO aware of skb->head_frag

On Wed, 2012-05-02 at 18:19 +0200, Eric Dumazet wrote:
> On Wed, 2012-05-02 at 09:16 -0700, Alexander Duyck wrote:
> 
> > I was working with the out-of-tree ixgbe because I have the option there
> > of stripping out FCoE and RSC via a couple of build flags.  The problem
> > is I don't know if the head frag stuff will work out very well with
> > ixgbe because RSC and FCoE require that we have to use 1K aligned
> > receive buffers.  It would require us to make us have to bump up our
> > allocation size by NET_SKB_PAD plus skb_shared_info which would likely
> > force us up to order 1 pages on most platforms.
> 
> What is RSC exactly, and why RSC is used in the build_skb() context ?
> 
> 

It looks like e1000e would be a good candidate for build_skb()
(without packet split)



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