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

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Date:	Wed, 12 Aug 2009 17:02:24 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>, 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 09:51:45AM -0400, Gregory Haskins wrote:
> Arnd Bergmann wrote:
> > On Wednesday 12 August 2009, Michael S. Tsirkin wrote:
> >>> 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
> >>>            
> >> Heh, you don't need a bridge in this picture:
> >>
> >> guest 1 - vhost - veth0 - veth1 - vhost guest 2
> > 
> > Sure, but the setup I described is the one that I would expect
> > to see in practice because it gives you external connectivity.
> > 
> > Measuring two guests communicating over a veth pair is
> > interesting for finding the bottlenecks, but of little
> > practical relevance.
> > 
> > 	Arnd <><
> 
> Yeah, this would be the config I would be interested in.

Hmm, this wouldn't be the config to use for the benchmark though: there
are just too many variables.  If you want both guest to guest and guest
to host, create 2 nics in the guest.

Here's one way to do this:

	-net nic,model=virtio,vlan=0 -net user,vlan=0
	-net nic,vlan=1,model=virtio,vhost=veth0
	-redir tcp:8022::22

	-net nic,model=virtio,vlan=0 -net user,vlan=0
	 -net nic,vlan=1,model=virtio,vhost=veth1
	-redir tcp:8023::22

In guests, for simplicity, configure eth1 and eth0
to use separate subnets.

Long term, I hope macvlan will be extended to support
guest to guest.

> Regards,
> -Greg
> 


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