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

[Serge Hallyn]

Quoting ITec (1079212 at bugs.launchpad.net):

Thanks for the .xml.  Nothing stands out there...

> What could you have done differently?

The main thing is that I used raring, not quantal.  This could be
somethign which was fixed in either qemu or the kernel.

> - Did you run 2 VMs at the same time?

yup

> - Is networking on your VMs using virtio?

yup

> - Did you start "iperf -s" on both VMs?

yup

> - Did you use iperf with "-d" option on two remote hosts to connect to
the VMs?

No, i did so from a single host.  I used two laptops connected over an
ethernet cable (with the one beign pxe+dhcp server for the other, my
regular install setup).

> - Are all hosts (KVM hypervisor, and both remote hosts) connected to
the same physical network switch by 1Gbit/s?

No switch involved.  I'll try using just quantal first on the VM host, but
wouldn't that be interesting if adding a switch caused this!

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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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