KVM: Poor guest network performance when using SR-IOV

Solution In Progress - Updated -

Issue

  • Noticeable slower speeds using KVM with SR-IOV than when we used the same hardware in a non-virtualized environment.
  • CPU utilization for the qemu-kvm process in the host is quite high.

Environment

  • Red Hat Enterprise Linux 7.0, 7.1, 7.2 and 7.3
    • qemu-kvm-1.5.3

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