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[Bug 1592809] [NEW] Restore irqfd fast path for PPC


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Dear Canonical,

A patch is now upstream to restore the irqfd fast path for Power, can
this be pulled into a 16.04.1? It was found to significantly help guest
small msg rate networking performance by ~30%.

Commit id:

  KVM: PPC: Book3S HV: Re-enable XICS fast path for irqfd-generated

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New

** Tags: architecture-ppc64le bugnameltc-142629 severity-medium targetmilestone-inin16041
Restore irqfd fast path for PPC
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