------- Comment From jhop...@us.ibm.com 2016-07-14 17:43 EDT-------
I updated to:  linux-image-4.4.0-31-generic       4.4.0-31.50

and remeasured performance, still looks good. Thanks! We can close this
bug now.

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https://bugs.launchpad.net/bugs/1592809

Title:
  Restore irqfd fast path for PPC

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  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:
  b1a4286b8f3393857a205ec89607683161b75f90

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

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