Testing various emulated devices shows:
- ne2k_pci gets the tx problems almost immediatly
- 8139cp on any slightly higher traffic
- e1000 seems to work

When pirq's are not used, 8139cp also works again. So there seems to be
a subtle bug in the delivery of those.

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https://bugs.launchpad.net/bugs/854829

Title:
  [Oneiric] Xen HVM: transmit timeouts on emulated 8139cp device

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