linux-kernel - Re: GSO with udp_tunnel_xmit

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Message-ID: <20151108105710.GA30282@gondor.apana.org.au>
Date:	Sun, 8 Nov 2015 18:57:10 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Jason A. Donenfeld" <Jason@...c4.com>
Cc:	Maciej Żenczykowski <zenczykowski@...il.com>,
	Tom Herbert <tom@...bertland.com>,
	Jiri Benc <jbenc@...hat.com>, Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: GSO with udp_tunnel_xmit_skb

On Sun, Nov 08, 2015 at 11:36:53AM +0100, Jason A. Donenfeld wrote:
>
> Wouldn't there be some significant savings from bundling together
> several UDP packets meant for the same destination, and sending those
> all as one super-packet, so they don't each have to traverse the whole
> networking and netfilter stack? By asking that question, it doesn't
> feel as though I've come up with a new idea; is there a reason why
> that isn't implemented or why (if) it was rejected?

UDP carries no ordering information so this doesn't work.

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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