[ntp:questions] Is 24PPM an Excessive Real-Time Clock Correction?

Karel Sandler sandler at ujf.cas.cz
Tue Jul 10 19:16:34 UTC 2007


"Spoon" <root at localhost> wrote:
>
> I count at least 6 "clocks" on a typical x86-based platform:
>
> o PIT (Programmable Interval Timer) e.g. Intel's 8253 and 8254
> o RTC (Real-Time Clock)
> o (Local??) APIC timer (not too sure about this one)
> o ACPI timer, also known as PM (Power Management) clock
> o CPU TSC (timestamp counter)
> o HPET (High Precision Event Timers)
>
A question, please: how can I pick up and localize the clock the ntpd is 
based on (in order to measure the temperature of its crystal). The systems 
used are Linux or FreeBSD.

Thanks.
--
Karel Sandler





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