Subject: Re: CVS commit: src/sys/kern
To: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
From: Perry E. Metzger <perry@piermont.com>
List: source-changes
Date: 08/06/2006 01:02:05
Izumi Tsutsui <tsutsui@ceres.dti.ne.jp> writes:
> perry@piermont.com wrote:
>
>> 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?
>
> Usually crytal oscillators have 10~200 ppm tolerance
> (including temperature dependency), so lower digits
> (under ~100kHz on 1GHz CPU) are not so significant.
>
> I'm just afraid such not-so-meaningful digits might confuse
> some users.

I doubt it, but more importantly, it is important for debugging and
other purposes to know what the value decided at boot time was.

Perry