On Wed, Jun 30, 2010 at 03:34:14PM -0400, Ted Unangst wrote:
> On Wed, Jun 30, 2010 at 3:23 PM, Luis Henriques <luis.hen...@gmail.com>
> wrote:
> > Probably, a silly question, but here it goes:
> >
> > With this patch, I will not be able to set the perflevel to, say, 50% and
> > keep the system using that performance level forever.  Is this correct?
> > I guess that with current apmd we are able to do this.
> >
> > If both of these two statements are true (maybe they are not!), we should
> > also have a mechanism to disable this code (either at runtime or compile
> > time).
>
> You are correct, but I wonder why you would ever want a machine only
> running at 50% all the time.  When it is busy, it's still slow, and
> when it's not, it's still using power.

In my X31 it scales between 600 and 1600 MHz, or something like that.
And when I keep it around setperf 40 it avoids turning the fan on. Which
is handy when for example you're compiling something and leave it by bed
;)
I didn't say it was a very good reason ;)

> We are thinking that states
> other than 0 and 100 are not very useful.  But this is not the final
> diff.  It will probably have some means of control eventually, until
> then, it'd be nice if people evaluated if this meets their needs.

--
viq

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