frequency tolerance: 500

[Achim Gratz]

Udo van den Heuvel via devel writes:
>> How close are you to "true" time when you start the ntpd?
>
> Within 100's of ms if not better.

If you are really that far off when you start ntpd, it can very easily
peg at the 500ppm mark.  That 500ppm limit means the clock will drift no
more than 0.5ms/s, so to correct for 100ms you'd need 200s for the
correction to take place and then you are still left with finding the
correct clock drift, which can easily take another hour after such a
large disturbance.  That's why ntpd usually steps the clock when it
starts up the first time, which should bring it into the low
single-digit ms range.


Regards,
Achim.
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