Messages in this thread | | | Subject | Re: How is user space notified of CPU speed changes? | From | Lee Revell <> | Date | Fri, 22 Oct 2004 14:05:16 -0400 |
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On Fri, 2004-10-22 at 07:23, Alan Cox wrote: > 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.
Seems like you are implying that any userspace app that needs to know the CPU speed is broken. Is this correct?
Lee
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