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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1322441

Title:
  QEMU Windows guest unstable after random amount of time

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 14.04, all updates done as of 23/5/2014
  Kernel : Linux 3.13.0-24-generic
  Qemu : 1.7.1 and 2.0.0 tested
  Tested using both Xeon 5620 and 5520 processors, 48GB RAM.

  Anywhere from 20 minutes for 3+ hours after booting Windows guests
  become unstable. Guest appear to freeze intermittently (VNC console
  unresponsive, network pings dropped to guest, frozen IO) for 20-60
  seconds at a time which repeats constantly every few minutes and
  guests do not recover unless QEMU is killed and the guest is started
  again. Whilst the guest is frozen CPU usage of the QEMU process jumps
  to 100-150%.

  WORKAROUND: Disable automatic NUMA balancing:
  echo 0 > /proc/sys/kernel/numa_balancing

  ---
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May 24 01:25 seq
   crw-rw---- 1 root audio 116, 33 May 24 01:25 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.1
  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
  HibernationDevice: RESUME=UUID=38dc08b6-55f7-482d-8f82-f048b3dbad56
  InstallationDate: Installed on 2013-03-21 (428 days ago)
  InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
  MachineType: Supermicro X8DTT
  Package: linux (not installed)
  PciMultimedia:

  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=UUID=386ad1f0-7ced-414f-9a09-4c078c36977c ro nomdmonddf nomdmonisw nomdmonddf nomdmonisw
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.2
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-05-21 (2 days ago)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 05/20/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080016
  dmi.board.asset.tag: 1234567890
  dmi.board.name: X8DTT
  dmi.board.vendor: Supermicro
  dmi.board.version: 2.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080016:bd05/20/2010:svnSupermicro:pnX8DTT:pvr1234567890:rvnSupermicro:rnX8DTT:rvr2.0:cvnSupermicro:ct17:cvr1234567890:
  dmi.product.name: X8DTT
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro

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