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[Bug 1435363] Re: KSM causing performance and instability issues



I installed a new machine from the 14.04.2 media which gave me the HWE
stack with kernel 3.16.0-33-generic and it's running with no problems.
The machine is now loaded up to 125GB worth of VMs and with the
following memory stats:

# free -m
             total       used       free     shared    buffers     cached
Mem:        257599     253046       4553          3        218     161499
-/+ buffers/cache:      91328     166271
Swap:            0          0          0

So, the server is quite loaded and I haven't seen any hiccups.  We'll
see from there on.


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  KSM causing performance and instability issues

Status in linux package in Ubuntu:

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

  LP: #1346917
  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.
   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)

  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
   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)

  _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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