| Re: [chrony-users] Newbie Help Needed |
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On Wed, Jan 10, 2018 at 12:06:00PM -0800, Stuart Maclean wrote:
> My results, after about 12 hours of chronyd running, are
> $ ./chronyc sourcestats
> 210 Number of sources = 2
>
> Name/IP Address NP NR Span Frequency Freq Skew Offset
> Std Dev
> ==============================================================================
>
> CSAC 6 3 80 -0.009 0.009 -519ns
> 67ns
> PPS 64 42 1009 +0.000 0.005 +2ns
> 3481ns
That looks good, but I'm wondering how is it possible that the CSAC
source is so stable and has such a small offset relative to the PPS.
Is your code combining the CSAC timestamp with the PPS timestamp? If
it was really that good, you could probably just the CSAC source
alone.
If it was a GPS NMEA source, you would see offset and jitter in
milliseconds.
--
Miroslav Lichvar
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