Re: cpufreq user<->kernel interface removal [was Re: community PM requirements/issues and PowerOP]

Pavel Machek
2006-09-17T13:20:19Z

On Sun 2006-09-17 17:10:36, Vitaly Wool wrote:
> Pavel,
>
> On 9/17/06, Pavel Machek <pavel@ucw.cz> wrote:
> >?? zaurus uses cpufreq just fine, and you could do that on omap. You'd
> >not have powersavings coming out of powering down devices, but
> >otherwise it should be doable.
>
> I do think you'd better broaden your views here ;)
> cpufreq as it is is not well-suitable for complex power management
> cases where you need to switch between multiple oscillators/clock
> sources/PLLs etc to gain the most efficien power management.
> Zaurus is not that complicated in PM AFAIK and I'm sure it could be
> even better if it used PowerOP or similar solution. :)

Well, I do think you'd better broaden your views here ;)
Solutions you propose are not well-suitable for big systems, like 8
cpu server box with 40 PCI devices.

What we need to do is something that works well from whole range, from
770 through thinkpad x60 to 8x Xeon server.
Pavel
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