I tried to reproduce this on a raring host I had handy and could not.
The throughput definately varied, but was not consistently lopsided.

This doesn't mean it is not present in quantal, or that I didn't do
something different from you.

Is the vhost_net kernel module loaded?  Could you please show the xml
for the vms?

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https://bugs.launchpad.net/bugs/1079212

Title:
  network slow when 2 VMs using virtio net bridged to same pyhs. network
  device on kvm host

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