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List:       kde-devel
Subject:    Re: [PATCH] powerdevil-remove-cpufreq.patch
From:       Oswald Buddenhagen <ossi () kde ! org>
Date:       2010-03-08 15:25:11
Message-ID: 20100308152511.GA19008 () troll08 ! nokia ! trolltech ! de
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On Mon, Mar 08, 2010 at 12:12:04PM +0100, Holger Macht wrote:
> You're taling about compile clusters, so you're obviously an experienced
> user and technician, but people aren't. Nobody wants to hinder you from
> setting things like that _manually_.
> 
riiiight ... because power users *want* to fiddle with the command line.
that's why we use kde, after all ...

> > a third datapoint is the wrongness of the assumption that the workload
> > is fixed and should just be executed as fast as possible. this certainly
> > isn't so, for example in interactive applications which refesh "as often
> > as possible" there is always somthing to do. downclocking the cpu is the
> > only way to conserve power in such a scenario.
> 
> Can you give an example where an application refreshes that fast that
> you would notice the impact?
>
an example would be an ide which is re-indexing in response to source
code changes. if the indexing takes longer than entering two characters,
then the first indexing will be simply aborted, having consumed only
part of the power.

a similar scenario would be imaginable for any cpu-intensive interactive
application which immediately displays e.g. a wireframe or interpolated
image in response to an action and then refines a display incrementally.
no example at hand right now.

games which try to make an as-good-as-possible physics simulation may
also continuously run at 100%.

> Frequencies are switched in microseconds these days.
>
that's utterly irrelevant in this context.
 
> > also, perceived slowness of the machine has a psychological effect of
> > not demanding too much of it, i.e., it changes the usage pattern to
> > something more power-friendly.
> 
> You don't notice the difference from using ondemand vs. performance,
> really.
> 
i'm talking about powersave vs. anything performance-oriented.
 
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