linux-kernel - Re: [patch 7/9] lguest: the net driver

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Message-ID: <20070509120030.GA12853@gondor.apana.org.au>
Date:	Wed, 9 May 2007 22:00:30 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, ak@...e.de, jeff@...zik.org,
	jmorris@...ei.org, netdev@...r.kernel.org
Subject: Re: [patch 7/9] lguest: the net driver

Hi Rusty:

On Wed, May 09, 2007 at 09:55:25PM +1000, Rusty Russell wrote:
> 
> 	NO_CSUM because it really doesn't need a checksum.  The
> LGUEST_NET_F_NOCSUM is only set for local inter-guest networking.  If
> some guest were to route the packets outside the machine, this would be
> an issue, though ("don't do that").

While I can see that this is good in keeping things simple, I think
it's something that you want to be able to support since the user
may wish to setup a guest as a firewall appliance which would involve
passing packets from another guest to the outside world.
 
> Indeed, that would be a new feature, and is certainly a consideration
> for more efficient inter-guest networking.  However, I consider that
> somewhat cheating: it's nice to know that 1500 doesn't suck too hard.
> 
> Remember, "Features kill puppies!" 8)

Heh :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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