I said:

I also wonder whether it might be productive to consider closing
the NTP "servo loop" in velocity (frequency) in this case, rather
than position (phase).

Before somebody else calls me on it, I should point out that NTP
actually uses both:

       "The clock discipline algorithm functions as a nonlinear, hybrid
phase/frequency-lock (NHPFL) feedback loop."

(see http://www.cis.udel.edu/~mills/database/brief/clock)

I'm wondering whether the clock discipline might better emphasize
only frequency in such circumstances, as opposed to merely tempering
the PLL.


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