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Re: [Qemu-devel] [PATCH-RFC 00/13] vhost-net: preview
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [PATCH-RFC 00/13] vhost-net: preview |
Date: |
Mon, 11 Jan 2010 20:09:10 +0000 |
User-agent: |
Mutt/1.4.1i |
On Mon, Jan 11, 2010 at 07:16:42PM +0200, Michael S. Tsirkin wrote:
> Here's an untested patchset with vhost support for upstream qemu. Note
> that you should not expect performance gains from vhost unless in-kernel
> irqchip is enabled (which is not in upstream qemu now). Since adding
> vhost involves quite a bit of infrastructure, I thought it makes sense
> to send an RFC already, so that interested parties can review it. In
> particular, command line and help text need to be finalized early to so
> that management can start looking on supporting the feature. This patch
> has all bits besides migration filled in. Also missing is packet socket
> backend: another team is now working on this.
Can you clarify a question about migration for me. Is it possible to
live migrate a guest configured with tap + bridge on one machine over
to another where it is launched with vhost + bridge, and vice-versa.
In other words does this vhost support have any guest visible impact
that would cause migraiton compatability problems, or it is purely a
host side optimization like vnet_hdr was ?
Regards,
Daniel
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