Messages in this thread | | | From | Stephen Rothwell <> | Subject | Re: kapm-idled using 45% CPU (why not 100%?) | Date | Sat, 31 Mar 2001 15:44:38 +1000 |
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Hi Jamie,
Jamie Lokier <lk@tantalophile.demon.co.uk> writes: > Subject says it all. On my laptop which is running 2.4.0, while the > machine is completely idle "top" reports kapm-idled as usin about 45% of > the CPU. The remaining 55% is reported as idle time.
This is normal behaviour ... the current implementation of kapm-idled means that it is sleeping some of the time, so the real idle process actually gets some time. I did a patch a while ago the got the kapm-idled up to about 93-95%, but I didn;t think i was all that important.
> When the machine gets a little more active, the CPU time attributed to > kapm-idled decreases while the 55% idle time increases to 85%!
Again this is normal (although it may not seem sensible).
> This is not caused be "top": I get the same 45% from "ps -l 3". > > I remember when kapmd was reporting 100%. Is the new behaviour > intentional, and is it saving the maximum power on the laptop?
I have NEVER seen kapmd getting 100%. You are probably getting about as good power saving as you will get (unfortunately) although don't hold me to that - I have heard of some laptops that get better power savings when CONFIG_APM_CPU_IDLE was NOT set ...
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