Re: CVS commit: src/sys/kern

["Perry E. Metzger" <perry%piermont.com@localhost>]

Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost> writes:
> perry%piermont.com@localhost wrote:
>
>> Yes. It tells you how many Hz the clock source is supposed to be. The
>> clock itself will certainly have some inaccuracy, but it tells you
>> exactly what the spec is.
>
> How is such Hz value taken?
> i.e. doesn't the measuring method (i8254_delay()?) have inaccuracy?

I was under the impression that for some counters with fixed
frequency, like the ACPI time register, that the frequency was
determined by specification. Am I mistaken on that?

In any case, I prefer to know exactly what the value chosen is.

>>> timecounter: Timecounter "TSC" frequency 1300162690 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300166200 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300133700 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300126680 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300159180 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300128370 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300135390 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300171530 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300152420 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300130320 Hz quality 800
>>> timecounter: Timecounter "TSC" frequency 1300171140 Hz quality 800



-- 
Perry E. Metzger                perry%piermont.com@localhost