Kernel threads using 100% on one of the two CPUs

[Arthur Lutz]

One of the two CPUs (AMD Athlon(tm) 64 X2 Dual Core Processor 3800+) is always full with kernel threads. htop shows a full red bar on CPU1 (2nd). I don't know how to investigate this problem, to find out which kernel thread is using all that CPU. I'm not even sure it has an impact on the performance (but since I'm having problems with audio stuff I'd like to be sure it's not this problem).

It seems that this problem was also reported here : http://osdir.com/ml/ubuntu-studio-users/2009-03/msg00119.html

Anyone know where I should look ?

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
Package: linux-image-2.6.28-3-rt 2.6.28-3.12
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-rt
Uname: Linux 2.6.28-3-rt x86_64

[psc (patrick-11h11)]

Hi,

I am having the exact same issue. htop report CPU1 (2nd) @ 100% while top say it's 1%. System Monitor (Gnome) report CPU1 (2nd) as hard-drive activity. The kernel seems to be unstable, freezing while rebooting, booting and using.

I am also using this kernel for audio related stuff. Without it, it's simply not enough (glitches).

Mac Book Pro (Intel)
2.6 Ghz x2
DistroRelease: Ubuntu 9.04
Package: linux-image-2.6.28-3-rt 2.6.28-3.12

[Maksym Strukov (unbelll)]

Hello.

I am having the same problem.

Notebook Dell Vostro 1310
Intel Core 2 Duo T5670 @ 1.8 Ghz
2 Gb Ram
Ubuntu 9.04

uname -a:
Linux power 2.6.28-3-rt # 12-Ubuntu SMP PREEMPT RT Fri Apr 17 10:09:12 UTC 2009 x86_64 GNU / Linux

Some pictures, if need:
http://translate.google.com/translate?js=n&prev=_t&hl=ru&ie=UTF-8&u=http%3A%2F%2Funbelll.blogspot.com%2F2009%2F06%2F2628-3-rt.html&sl=ru&tl=en&history_state0=

[Alessio Igor Bogani (abogani)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue that you reported is one that could be fixed in the Beta release of Karmic Koala. It would help us greatly if you could test with it! Thanks again and we appreciate your help.

[Maksym Strukov (unbelll)]

uname -a: Linux power 2.6.31-7-rt #9-Ubuntu SMP PREEMPT RT Wed Oct 7 22:08:13 UTC 2009 i686 GNU/Linux

All ok.

[Maksym Strukov (unbelll)]

Sorry, forgot to specify the version of Ubuntu. Ubuntu Karmic 9.10

[Alessio Igor Bogani (abogani)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. I am closing it because the bug has been fixed in the latest development version of Ubuntu - Karmic Koala.

This is a significant bug in Ubuntu. If you need a fix for the bug in previous versions of Ubuntu, please do steps 1 and 2 of the SRU Procedure [1] to bring the need to a developer's attention.

[1]: https://wiki.ubuntu.com/StableReleaseUpdates#Procedure