Patrik,
Me and my colleagues run in to the same performance problem with the PF functions when SR-IOV was enabled, but it seems like an upgrade of the ixgbe and ixgbevf driver seem to have solved the problem. We ran with:
ixgbe driver 3.18.7
ixgbevf driver 2.11.3
Enea Linux with kernel 3.10
and got the same results with and without SR-IOV enabled.
Regards,
- Johan