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Date: Thu, 13 Aug 2009 09:31:13 +0300 From: "Michael S. Tsirkin" <mst@...hat.com> To: Anthony Liguori <anthony@...emonkey.ws> Cc: Arnd Bergmann <arnd@...db.de>, virtualization@...ts.linux-foundation.org, "Ira W. Snyder" <iws@...o.caltech.edu>, netdev@...r.kernel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/2] vhost_net: a kernel-level virtio server On Wed, Aug 12, 2009 at 02:27:31PM -0500, Anthony Liguori wrote: > Arnd Bergmann wrote: >>> As I pointed out earlier, most code in virtio net is asymmetrical: guest >>> provides buffers, host consumes them. Possibly, one could use virtio >>> rings in a symmetrical way, but support of existing guest virtio net >>> means there's almost no shared code. >>> >> >> The trick is to swap the virtqueues instead. virtio-net is actually >> mostly symmetric in just the same way that the physical wires on a >> twisted pair ethernet are symmetric (I like how that analogy fits). >> > > It's already been done between two guests. See > http://article.gmane.org/gmane.linux.kernel.virtualization/5423 > > Regards, > > Anthony Liguori Yes, this works by copying data (see PATCH 5/5). Another possibility is page flipping. Either will kill performance. -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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