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[Tamas Papp <1341195@xxxxxxxxxxxxxxxxxx>]

I think we can be sure, that KSM_ENABLED=0 definitely helps.

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https://bugs.launchpad.net/bugs/1341195

Title:
  KVM guests getting slow by time

Status in “linux” package in Ubuntu:
  Incomplete
Status in “qemu” package in Ubuntu:
  Incomplete

Bug description:
  There is a post with very similar symptoms on serverfault:

  http://serverfault.com/questions/609881/windows-server-2012-on-kvm-on-
  ubuntu-14-04-runs-well-for-a-while-and-then-slows/612084#612084

  
  Basically all kind of KVM guests are getting slow by time, both windows or linux. The more running guests, it happens sooner.
  Switching back to Saucy kernel is a good workaround.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: qemu-kvm 2.0.0+dfsg-2ubuntu1.1
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  Date: Sat Jul 12 22:18:49 2014
  SourcePackage: qemu
  UpgradeStatus: No upgrade log present (probably fresh install)

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