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SubjectRe: [PATCHv2 0/2] vhost: a kernel-level virtio server
Michael S. Tsirkin wrote:
> 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.

I can try to do a few variations, but what I am interested is in
performance in a real-world L2 configuration. This would generally mean
all hosts (virtual or physical) in the same L2 domain.

If I get a chance, though, I will try to also wire them up in isolation
as another data point.

Regards,
-Greg


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