perf samples too long

[Michael Heuberger]

I always see these lines in `dmesg` and wonder what these mean:
[ 3805.057535] perf samples too long (2507 > 2500), lowering kernel.perf_event_max_sample_rate to 50000

They repeat often and I think the value kernel.perf_event_max_sample_rate should be somehow optimized. How can I do that?

Or it is a bug?

Thanks
Michael
---
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: michael.heuberger 1907 F.... pulseaudio
 /dev/snd/controlC1: michael.heuberger 1907 F.... pulseaudio
 /dev/snd/controlC0: michael.heuberger 1907 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=4bbd9d93-8982-4c0a-a955-0554ee12e4f8
InstallationDate: Installed on 2014-05-01 (4 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: System manufacturer System Product Name
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=47ab151a-c47d-4eff-ab5b-7751fc32014d ro quiet
ProcVersionSignature: Ubuntu 3.13.0-24.46-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
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: yes
  Hard blocked: no
Tags: trusty
Uname: Linux 3.13.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/10/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0701
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P6X58D-E
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0701:bd05/10/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6X58D-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1316110

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Michael Heuberger (michael.heuberger)]

apport information

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.15 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc4-utopic/

[Michael Heuberger (michael.heuberger)]

Ummm, sorry, I am a bit unsure here.

What apt-get commands should I enter for installing the latest kernel?

And how can I be sure this won't destroy my Ubuntu installation? I need the machine for work etc.

[penalvch (penalvch)]

Michael Heuberger, this messages you see are intentional as per https://lkml.org/lkml/2013/5/29/640 . In the future, instead of filing a bug report for something you are unsure of, it would be best to raise a question in the support tracker via https://answers.launchpad.net/ubuntu/+source/linux/+addquestion .

[Michael Heuberger (michael.heuberger)]

You are right, thanks for explaining and the link.