kapm-idled
Tom Breza
Hi I just instoled kernel 2.4 on my Tosh Satelite pro 4320
and I found that proces kapm-idled is taking quite a lot of CPU time
this is line from top
PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
3 root 19 0 0 0 0 SW 0 71.6 0.0 14:46 kapm-idled
this proces take all the time so much of procesor Time, thats quite
inoying, anyone know anything about it?
I belive that is somthing with APM, in Kernel conf I took support for
Toshiba Laptop and APM is also activate,
This is not really good to keep on laptop becuse battery will run quickly
I will be pleased for any sugestion
siaraX
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Brian Connelly
kapm-idled is supposed to to is tell the kernel/hardware that the machine
is idle, and, on some machines, power savings MAY occur. I disabled it
myself..
For more information, check out CONFIG_APM_CPU_IDLE
% Brian Connelly
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% http://www.bconnelly.net
Stefan Fleiter
Hi,
could you please learn how to quote?
One's own additions always belong below the part you are refering to.
I corrected this for you this time.
>> Hi I just instoled kernel 2.4 on my Tosh Satelite pro 4320 and I found that
>> proces kapm-idled is taking quite a lot of CPU time this is line from top
> I noticed the same process running on my laptop. Basically what
> kapm-idled is supposed to to is tell the kernel/hardware that the machine
> is idle, and, on some machines, power savings MAY occur. I disabled it
> myself..
>
> For more information, check out CONFIG_APM_CPU_IDLE
Yes and you should have recognized that there are no negative side effects
of kapm-idled it does _not_ consume CPU Power which would be needed otherwise.
Test it while encoding videos or something else which should consume all
CPU-power by itself.
So you could say it is a cosmetical bug, but not more.
Stefan
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Florian Lohoff
> Hi I just instoled kernel 2.4 on my Tosh Satelite pro 4320
> and I found that proces kapm-idled is taking quite a lot of CPU time
> this is line from top
>
> PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
> 3 root 19 0 0 0 0 SW 0 71.6 0.0 14:46 kapm-idled
>
> this proces take all the time so much of procesor Time, thats quite
> inoying, anyone know anything about it?
> I belive that is somthing with APM, in Kernel conf I took support for
> Toshiba Laptop and APM is also activate,
> This is not really good to keep on laptop becuse battery will run quickly
>
> I will be pleased for any sugestion
Its the time the kernel spend doing "APM" (Advanced Power Management)
idle calls into the BIOS. This normally should lead to less power
consumption.
Flo
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Why is it called "common sense" when nobody seems to have any?
Tom Breza
> of kapm-idled it does _not_ consume CPU Power which would be needed otherwise.
>
> Test it while encoding videos or something else which should consume all
> CPU-power by itself.
>
> So you could say it is a cosmetical bug, but not more.
hmmmm maybe is stupid question but ...
if mashine is going in to suspend mode then system shoud slow down
procesor speed and swith off all device wich can be off, if procesor is running allmost on
full power then needs more power? is that right?
then means that for me if procesor is loaded in full need more power =
shorter battery work?
siaraX
Stefan Fleiter
Hi,
>> Yes and you should have recognized that there are no negative side effects
>> of kapm-idled it does _not_ consume CPU Power which would be needed
>> otherwise.
>> Test it while encoding videos or something else which should consume all
>> CPU-power by itself.
>> So you could say it is a cosmetical bug, but not more.
> hmmmm maybe is stupid question but ...
> if mashine is going in to suspend mode then system shoud slow down
> procesor speed
Not many processors are able to do that.
The Crusoe does it perfect, but Intel Speed Step processors only are able to
reduce the speed in one single step IIRC. AFAIK AMDs processor are not able
to do that yet.
All processors from Intel and AMD since the Pentium 75-S are able to do a
hlt-command which shut's them virtually off until the next interrupt occurs.
That saves some power.
> and swith off all device wich can be off, if procesor is running allmost on
> full power then needs more power? is that right?
When your CPU is idle it does not consume as much power as when it is
heavily working if it is that what you meant.
> then means that for me if procesor is loaded in full need more power =
> shorter battery work?
Exactly.
But you should, what was my point, not include kapm-idled in that assumption
because that makes your computer save battery power.
Stefan
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Tom Breza
>
> > and swith off all device wich can be off, if procesor is running allmost on
> > full power then needs more power? is that right?
>
> When your CPU is idle it does not consume as much power as when it is
> heavily working if it is that what you meant.
>
> > then means that for me if procesor is loaded in full need more power =
> > shorter battery work?
>
> Exactly.
> But you should, what was my point, not include kapm-idled in that assumption
> because that makes your computer save battery power.
>
somthing like they coud "hide" this and do not show it. If thats not
taking power unneceserry or is some fake is not relly good to show this,
some ppl have on takskbar
applet wich show how much power of procesor is in use, few
times i found out that MC hang (when I use it from root account) and it
take almost all procesor speed, when kill this proces was
fine, but in simmilar situation ppl will have fals alarms :>
siaraX