| Re: [chrony-dev] makestep command sometimes makes chrony stop reading its sources |
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On Thu, Jan 21, 2010 at 09:06:46AM -0800, Bill Unruh wrote:
> chrony works only with microseconds, not nanoseconds. Thus it cannot
> discipline to better than a microsecond, even if the dispersion reads less
> than that. All of chrony is designed with 1usec as the quantization
> limit.
Microseconds are used for timestamping, but offsets are stored in
double format (and the PPS refclock produces nanoseconds).
The problem is in slewing the clock below microseconds. It could be
done by using kernel PLL in nano mode with short time constant or
doing temporary frequency adjustment like fast slewing does. Both are
not perfect though.
--
Miroslav Lichvar
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