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[Chris J Arges <1435363@xxxxxxxxxxxxxxxxxx>]

In addition could you explain more in depth about the performance an
instability issues you've observed? How do you detect them or test for
them? Thanks

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https://bugs.launchpad.net/bugs/1435363

Title:
  KSM causing performance and instability issues

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This seems to be a bug that has regressed, I have encountered the same
  issue as 2 other reports:

  LP: #1349897

  Running kernel: 3.13.0-46-generic

  This is replicated over many compute nodes (KVM) running OpenStack.
  The workaround is to disable KSM:

  echo 2 > /sys/kernel/mm/ksm/run

  This fixes the issue temporarily.
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 22 14:30 seq
   crw-rw---- 1 root audio 116, 33 Mar 22 14:30 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-12-14 (99 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  MachineType: Dell Inc. PowerEdge R620
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-46-generic.efi.signed root=UUID=68d30a86-3c67-4691-b142-d27a459986e8 ro
  ProcVersionSignature: Ubuntu 3.13.0-46.79-generic 3.13.11-ckt15
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-46-generic N/A
   linux-backports-modules-3.13.0-46-generic  N/A
   linux-firmware                             1.127.11
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty
  Uname: Linux 3.13.0-46-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 01/16/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.2.2
  dmi.board.name: 01W23F
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr2.2.2:bd01/16/2014:svnDellInc.:pnPowerEdgeR620:pvr:rvnDellInc.:rn01W23F:rvrA05:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R620
  dmi.sys.vendor: Dell Inc.

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