Re: How is user space notified of CPU speed changes?

[Alan Cox]

On Gwe, 2004-10-22 at 00:01, Lee Revell wrote:
> This issue came up on the JACK (http://jackit.sf.net) mailing list. 
> Google was not helpful so I ask here.
> 
> JACK needs to know the CPU speed, in order to calculate the DSP load
> among other things.  It used to be a valid assumption that you could
> calculate it on startup and it would not change.

No it did not. It has never been a safe assumption. Even my old PC110
does APM non-linux assisted shifts between 8 16 and 33Mhz. In addition
there are boxes with dual CPU's and different multipliers - dual 
300/450's were not uncommon.

And thats before we even mention such things at hyped-threading.

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