[sf-lug] what is kondemand and how to put it in a cage?

Ken Shaffer kenshaffer80 at gmail.com
Fri Aug 17 12:46:18 PDT 2012

Check out the ondemand service (cpu freqeuency scaling)

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    kondemand is a kernel thread that belongs to the ondemand governor of
cpufreq subsystem, which changes the p-states of the system, based on the
utilization statistics. Thus it’s something that helps in power management.

On Fri, Aug 17, 2012 at 10:55 AM, jim <jim at systemateka.com> wrote:

> My machine has slowed waaaay down.
> $ top
> shows kondemand hopping in and out of about sixth
> place in the list, and in the form of
> kondemand/0
> kondemand/1
> (separate processes running often simultaneously).
> $ man kondemand
>  No manual entry for kondemand
> http://www.linuxquestions.org/questions/linux-general-1/anyone-knows-what-is-kondemand-759463/
> this forum's comments are largely the same as mine
> (wtf?), with suggestions to use a web search engine
> to get info and replies that the web search engine
> pretty much circularly refers to this topic.
>     The irritation is that kondemand seems to take
> 20% CPU time.
>     One user claims he's shut down his laptop and
> removed the battery and then restored everything and
> rebooted with the result that kondemand then takes
> only 1% of CPU time.
>     Anybody know what is kondemand?
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