Public bug reported:

rtl8139 is the default network adapter provided in openstack instances.

That is very slow compared to virtio.  The only reason you would want it
would be for backwards compatibility.

I believe that right now is the time to change that to virtio. If we
wait until after 12.04, we may, in 14.04 actually have a large corpus of
users who would have broken images by changing that default.  Right now
there are comparably a very small number of users/amis that would not
support virtio.

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/904480

Title:
  change default networking to virtio in Ubuntu packaging

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