>OK, so there was no magic in that 500PPM limit. Is there a difference
>between the tick size adjustment and the frequency adjustment 
>(CPU-counter-to-time conversion factor).

Limiting the slew rate to something like that means that
software that is timing things with code like:
  grab time, do something, grab time, subtract
gets a sane answer if it happens to be running while somebody
adjusts the time.

-- 
These are my opinions, not necessarily my employer's.  I hate spam.

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