Pavel Machek wrote:
>
> Hi!
>
> > > there are notebooks which change the CPU speed and voltage (and the TSC
> > > speed as well), depending on the load. This is a much bigger problem.
> >
> > Current x86 notebooks dont change the TSC speed. They change the clock duty
> > cycle not the clock rate.
>
> That is not true!
>
> I have two different notebooks (toshiba satellite 4030cdt and ibm
> thinkpad), both of them change tsc speed (log from toshiba:)
>
> Mar 29 23:35:22 bug apmd[72]: Now using Battery Power
> Mar 29 23:35:22 bug apmd[72]: Battery: * * * (100% 2:22)
> Mar 29 23:40:06 bug kernel: TSC is slower than it should be! Detected
> 151955503 Hz processor.
> Mar 29 23:40:07 bug kernel: TSC is faster than it should be! Detected
> 299947489 Hz processor.
>
This is bad design. It means the TSC is useless on that system.
-hpa
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