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SubjectRE: CPU frequency shifting "problems"
>  > APM is a lost cause, but the correct solution for ACPI systems is 
>to use the
>> PM timer.
>This is _completely_ untrue.
>The PM timer is (a) inaccurate and (b) slow as hell.
>Linux uses TSC because we want high accuracy (nanosecond scale) without
>having slow stuff.

Please, don't confuse accuracy with precision. The TSC is precise
but not accurate. The 100Hz timer is more accurate, especially given
a SpeedStep CPU, but much less precise. It's a subtle distinction,
but an important one.

from: Jonathan "Chromatix" Morton
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