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Bug 53273 - kapm-idled consumes an excessive amount of CPU time
kapm-idled consumes an excessive amount of CPU time
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brock Organ
Depends On:
  Show dependency treegraph
Reported: 2001-09-05 18:40 EDT by Landon Curt Noll
Modified: 2007-04-18 12:36 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2001-09-05 20:48:48 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Landon Curt Noll 2001-09-05 18:40:17 EDT
From Bugzilla Helper:
User-Agent: Mozilla/4.78 [en] (X11; U; Linux 2.2.19-7.0.8 i686)

Description of problem:
The kapm-idled process consumes an excessive amount of CPU time on my
IBM Thinkpad 770Z running RH7.1  Typically it is consuming ~75% of the CPU
leaving only 25% CPU for idle time.

The system is fairly sluggish when this process is consuming CPU time. 
niced processes get almost no CPU time.

Because this is a kernel process, one cannot even kill it.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.run top on an IBM Thinkpad 770Z

Actual Results:  Process 3 is hugging ~75% of the CPU.

Expected Results:  An idle system would have nearly 100% of the CPU

Additional info:
Comment 1 Landon Curt Noll 2001-09-05 20:43:37 EDT
When I re-build the kernel with CONFIG_APM_CPU_IDLE not set, the
kapm-idled no longer became a CPU hog.

Is that a bug or a feature?  If feature, it is certainly a mis-feature on
the IBM Thinkpad 770Z.
Comment 2 Landon Curt Noll 2001-09-05 20:48:42 EDT
Changed the sevarity to Normal since there is a work-a-round to
compile a kernel without CONFIG_APM_CPU_IDLE.
Comment 3 Arjan van de Ven 2001-09-06 04:26:33 EDT
It's a feature. kapm-idled is ALSO the idle task, but the one where your laptop
goes into powersave mode during idle.....
I agree it's a bit confusing to see it show up though.

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