Re: [PATCH][2.5.32] CPU frequency and voltage scaling (0/4)

[george anzinger <george@mvista.com>]

Linus Torvalds wrote:
> 
> In article <1030618420.7290.112.camel@irongate.swansea.linux.org.uk>,
> Alan Cox  <alan@lxorguk.ukuu.org.uk> wrote:
> >>  { min-Hz, max-Hz, policy }
> >>
> >
> >For a few of the processors "event-hz" or similar would be nice. The
> >Geode supports hardware assisted bursting to full processor speed when
> >doing SMM, I/O and IRQ handling.
> 
> Hmm.. I would assume that you'd just use the high frequency for that?
> So, for example, assuming you have a 600/300 Geode, when you do
> 
>         { 0, ~0UL, "power-save" }
> 
> that would tell the Geode driver to run at 300MHz normally
> ("power-save"), and at 600Mhz when doing critical events.
> 
> In contrast, a
> 
>         { 0, ~0UL, "performance" }
> 
> mode would mean that it always runs at 600MHz (modulo heat throttling,
> of course).
> 
> And a
> 
>         { 300, 300, "power-save" }

How about { 50, 50, "power-save" }  where the number refers
to percent of full?
I.e. same meaning IFF full is 600, but suppose it is 800.
> 
> means that you want the chip to always run at 300MHz, even when handling
> critical events.
> 
> I don't know the exact details of what kinds of frequencies the Geode
> supports, but it sounds to me like you don't really need another
> frequency value..
> 
>                 Linus
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
George Anzinger   george@mvista.com
High-res-timers: 
http://sourceforge.net/projects/high-res-timers/
Preemption patch:
http://www.kernel.org/pub/linux/kernel/people/rml