netdev - Re: [PATCH v4 net-next] net: introduce dev_set

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Date:	Fri, 8 Nov 2013 13:21:20 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, bhutchings@...arflare.com,
	christoph.paasch@...ouvain.be, netdev@...r.kernel.org,
	hkchu@...gle.com, mwdalton@...gle.com
Subject: Re: [PATCH v4 net-next] net: introduce dev_set_forwarding()

On Thu, Nov 07, 2013 at 09:08:49PM -0800, Eric Dumazet wrote:
> On Fri, 2013-11-08 at 12:43 +0800, Herbert Xu wrote:
> 
> > Easy.  You don't physically segment the packet until it's
> > transmitted.  But logically you treat each GRO/GSO packet as if it
> > had already been segmented.
> 
> OK, please submit some patches, because I must be blind.

Honestly it doesn't even matter.  If it's really so bad for your
qdisc, you should just call skb_segment in your qdisc directly.

My point is that even if you did that GRO with your frag_list
patch should still be a win because the stack prior to the qdisc
gets run once instead of two or three times.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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