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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