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[Bug 1581681] Re: KVM slowed down with aparently no reason.

 

Ok so it looks like upgrading to 15.10 the problem has been solved.

The "CPU Bug" (attached) is still getting at boot time, but it looks
harmless. Also SuperMicro has a FAQ that contains exactly this problem
and they say that a BIOS Update solves the problem:
http://www.supermicro.com/support/faqs/faq.cfm?faq=20349

But the main problem that is the slow-down of the KVM and the errors on
dmesg disappeared when upgrading from 15.04 to 15.10 (that upgrades the
kernel from 3.16 to 4.2) - I think this ticket can be closed since the
solution is to upgrade the distro (probably better to 16.04)

** Attachment added: "cpu-bug.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1581681/+attachment/4663974/+files/cpu-bug.txt

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https://bugs.launchpad.net/bugs/1581681

Title:
  KVM slowed down with aparently no reason.

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The server was working perfectly for months, suddenly (yesterday) it
  started to slow down the VMs and now I noticed that the CPU Use is
  very high and a lot of messages on the dmesg.

  I checked if it had any kernel update, but the latest update were from
  last year.

  I will try upgrading the server to 16.04 in a few days if I can't
  solve the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-22-generic 3.19.0-22.22
  ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Fri May 13 18:34:48 2016
  HibernationDevice: RESUME=UUID=c4fb9a3e-4d30-4e3b-96d0-404c6707855f
  InstallationDate: Installed on 2015-06-22 (325 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Intel Corporation S2600CW
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-22-generic root=UUID=c6ae046b-62b0-479c-967e-377c7604dd1e ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-22-generic N/A
   linux-backports-modules-3.19.0-22-generic  N/A
   linux-firmware                             1.143.1
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-07-13 (305 days ago)
  dmi.bios.date: 10/17/2014
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: SE5C610.86B.01.01.0005.101720141054
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: S2600CW
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H44615-351
  dmi.chassis.asset.tag: ....................
  dmi.chassis.type: 17
  dmi.chassis.vendor: ..............................
  dmi.chassis.version: ..................
  dmi.modalias: dmi:bvnIntelCorporation:bvrSE5C610.86B.01.01.0005.101720141054:bd10/17/2014:svnIntelCorporation:pnS2600CW:pvr....................:rvnIntelCorporation:rnS2600CW:rvrH44615-351:cvn..............................:ct17:cvr..................:
  dmi.product.name: S2600CW
  dmi.product.version: ....................
  dmi.sys.vendor: Intel Corporation

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