netdev - Re: [RFCv2 00/12] Introduce host-side virtio queue and CAIF Virtio.

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Message-ID: <20130111073155.GA13315@redhat.com>
Date:	Fri, 11 Jan 2013 09:31:55 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Sjur Brændeland <sjurbren@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFCv2 00/12] Introduce host-side virtio queue and CAIF Virtio.

On Fri, Jan 11, 2013 at 09:18:33AM +1030, Rusty Russell wrote:
> "Michael S. Tsirkin" <mst@...hat.com> writes:
> > On Thu, Jan 10, 2013 at 09:00:55PM +1030, Rusty Russell wrote:
> >> Not sure why vhost/net doesn't built a packet and feed it in
> >> netif_rx_ni().  This is what tun seems to do, and with this code it
> >> should be fairly optimal.
> >
> > Because we want to use NAPI.
> 
> Not quite what I was asking; it was more a question of why we're using a
> raw socket, when we trivially have a complete skb already which we
> should be able to feed to Linux like any network packet.
> 
> And that path is pretty well optimized...
> 
> Cheers,
> Rusty.


Oh for some reason I thought you were talking about virtio.
I don't really understand what you are saying here - vhost
actually calls out to tun to build and submit the skb.

-- 
MST
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