linux-kernel - Re: [PATCHv2 0/2] vhost: a kernel-level virtio server

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Message-ID: <20090812130612.GC29200@redhat.com>
Date:	Wed, 12 Aug 2009 16:06:12 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Gregory Haskins <gregory.haskins@...il.com>,
	netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	hpa@...or.com, Patrick Mullaney <pmullaney@...ell.com>
Subject: Re: [PATCHv2 0/2] vhost: a kernel-level virtio server

On Wed, Aug 12, 2009 at 02:52:01PM +0200, Arnd Bergmann wrote:
> On Wednesday 12 August 2009, Gregory Haskins wrote:
> > >> Are you saying SRIOV is a requirement, and I can either program the
> > >> SRIOV adapter with a mac or use promis?  Or are you saying I can use
> > >> SRIOV+programmed mac OR a regular nic + promisc (with a perf penalty).
> > > 
> > > SRIOV is not a requirement. And you can also use a dedicated
> > > nic+programmed mac if you are so inclined.
> > 
> > Makes sense.  Got it.
> > 
> > I was going to add guest-to-guest to the test matrix, but I assume that
> > is not supported with vhost unless you have something like a VEPA
> > enabled bridge?
> > 
> 
> If I understand it correctly, you can at least connect a veth pair
> to a bridge, right? Something like
> 
>            veth0 - veth1 - vhost - guest 1 
> eth0 - br0-|
>            veth2 - veth3 - vhost - guest 2
>           
> It's a bit more complicated than it need to be, but should work fine.
> 
> 	Arnd <><

Heh, you don't need a bridge in this picture:

guest 1 - vhost - veth0 - veth1 - vhost guest 2

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