netdev - Re: [PATCH 2/2] vhost_net: a kernel-level virtio server

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Message-ID: <20090813144129.GB5080@redhat.com>
Date:	Thu, 13 Aug 2009 17:41:30 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	"Ira W. Snyder" <iws@...o.caltech.edu>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 2/2] vhost_net: a kernel-level virtio server

On Thu, Aug 13, 2009 at 03:48:35PM +0200, Arnd Bergmann wrote:
> On Thursday 13 August 2009, Arnd Bergmann wrote:
> > Unfortunately, this also implies that you could no longer simply use the
> > packet socket interface as you do currently, as I realized only now.
> > This obviously has a significant impact on your user space interface.
> 
> Also, if we do the copy in the transport, it definitely means that we
> can't get to zero-copy RX/TX from guest space any more. The current
> vhost_net driver doesn't do that yet, but could be extended in the
> same way that I'm hoping to do it for macvtap.
> 
> 	Arnd <><

The best way to do this IMO would be to add zero copy support to raw
sockets, vhost will then get it basically for free.

-- 
MST
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