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[Bug 1368439] Re: Random high latency with KSM enabled and multiple CPU sockets

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Lawrence Dudley <lawrence@xxxxxxxxx>
Date: Fri, 12 Sep 2014 17:38:21 -0000
Reply-to: Bug 1368439 <1368439@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Wait, someone else needs to mark it as confirmed.

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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:
  Incomplete
Status in “qemu-kvm” package in Ubuntu:
  New

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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