[ntp:questions] Remarkably good CPU oscillators?

David L. Mills mills at udel.edu
Sun Nov 5 18:12:02 UTC 2006


See FreeBSD 6.1 rackety.udel.edu or Solaris 10 pogo.udel.edu; both 
behave nominally as you observe with GPS and PPS. Both are near each 
other in our machine room; both keep the clock generally within a few 
tens of microseconds, even with a client population of sevaral hundred.



shoppa at trailing-edge.com wrote:

> I have a tiny mini-ITX motherboard that has served as a stratum-1 for
> several years.
> It sits in the basement, so no radically wild swings in temperature or
> other environmental factors.
> Still, this morning when I look back at a few years of loopstats, the
> oscillator in this thing is remarkably, and maybe unbelievably, stable.
> It has stuck in the -2.5 to -5.5 PPM range over the past two years, and
> in a typical daily swing it might go up and down by a 0.5 PPM.
> Is this statistic just "too good to be true"? Or did I luck out when I
> bought this box many years ago?
> It has two refclocks available, wwv_audio and a Z3801A (via hpgps and a
> PPS nanokernel), and cross-checking between the two I believe them
> both.
> Tim.

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