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

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Message-Id: <200908131548.35199.arnd@arndb.de>
Date:	Thu, 13 Aug 2009 15:48:35 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	virtualization@...ts.linux-foundation.org
Cc:	"Michael S. Tsirkin" <mst@...hat.com>, 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 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 <><
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