[Bug 1079212] Re: network slow when 2 VMs using virtio net bridged to same pyhs. network device on kvm host

[Serge Hallyn]

Was able to easily reproduce this now with just 'iperf -c <ip> -d".
When I ran your longer loop before it never seemed to happen.  I believe
'-n 10' just made it transfer more data, which smoothed over the
inequities here.

[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-10.0 sec  20.5 MBytes  17.1 Mbits/sec
[  4]  0.0-10.0 sec   564 MBytes   471 Mbits/sec

I'm not sure there's really a bug here, as opposed to the host cpu doing
the best it can to load-balance too much work.  I'll re-try with raring
now and look for any differences.

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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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