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SubjectRe: [PATCH] Add p4-clockmod driver in x86-64
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On Mer, 2004-10-27 at 22:38, Rutger Nijlunsing wrote:
> So you've got the _disadvantages_ of a slow clock (programs run
> slower), and not the _advantages_ (power consumption is same as idle
> CPU and not lower, temperature is same as idle CPU and not lower).
>
> But why does the P4 have such a mode? It uses this mode during thermal
> throttling to get to the 'idle' temperature.

It isn't obvious how you software idle a PIV - "hlt" at least does not
seem to do that.

> Therefore, p4-clockmod is completely misnamed: it's _not_ a cpufreq
> driver in the sense that it does not change the frequency.

It performs a similar function less efficiently. Lots of older chipsets
for K6 and the like also only support this form of clock control.

Alan

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