[EMAIL PROTECTED] wrote:
>
> (1) Our measurements show that the 8253 is not as precise as the TSC.
I do not understand what you mean for precision. Clearly the 8253 run a
about 1 Mhz and cannot have a resolution of a TSC running at 600 Mhz. If
you refer to stability for the relatively short times we verified is as
good.
> (2) relying on the tick count for actual time is not a good idea if you
> need to be very precise.If you really need to know the time in the
> outside world, you should sync with a precise time of day source.
> None of the PC timers are designed to provide that.
Agreed. I just meant that once you go periodic you cannot resolve
nothing but the period and that is the only timing resolution you have
and can trust. In most application, likely to be digital control
systems, people
needs just a stable pacing not a precise solar time. Those are usually
the most demanding applications.
Ciao,
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