kernel-packages team mailing list archive

[Lucas Teske <lucas@xxxxxxxxxxxx>]

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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