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[Launchpad Bug Tracker <1368439@xxxxxxxxxxxxxxxxxx>]

[Expired for qemu-kvm (Ubuntu) because there has been no activity for 60
days.]

** Changed in: qemu-kvm (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1368439

Title:
  Random high latency with KSM enabled and multiple CPU sockets

Status in linux package in Ubuntu:
  Expired
Status in qemu-kvm package in Ubuntu:
  Expired

Bug description:
  If running a box with multiple CPU sockets and Ubuntu 14.04 Server
  64-bit qemu-kvm with KSM enabled as by default, random high latency
  occurs on network connections for VMs, as high as 4000ms - 5000ms. The
  host also reports high IO wait times.

  Disabling KSM fixed this for me.

  I run the same setup on boxes with only 1 CPU socket and it's not an
  issue.

  qemu-kvm version: Installed: 2.0.0+dfsg-2ubuntu1.3

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