[ntp:questions] refclock on Windows graphs
unruh-spam at physics.ubc.ca
Wed Mar 18 00:52:51 UTC 2009
"David J Taylor" <david-taylor at blueyonder.neither-this-bit.nor-this.co.uk> writes:
>> Maybe when someone finally put refclock support into chrony you will
>> your wish.
>Not until it runs under Windows.
>> It sounds like your temp changes causing rate changes on a
>> that ntp cannot properly cope with. (ntp is terrible at coping with
>> changes-- a purposeful design decision by Mills). I get about 3-5
>> usec as
>> average offset, but the freq changes are only about .1PPM , not 3PPM.
>> room is not particularly air conditioned, but the temp variations
>> over the
>> day are probably less than 5C not 20C.
>Here it's probably a variation of at least 10C. The computer CPU use
>itself is fairly constant throughout the day, so it may well track ambient
>Another PC in the same room running a FreeBSD system has about half the
>jitter, but far less offset - PC Pixie at the top:
That looks much more like the kind of timing I get on my Linux system.
driven by a PPS from a Garmin 18LVC.
I assume that the rate is also far more constant on that system.
>I recall trying some of the motherboard temperature monitoring software,
>but probably not for that PC. I'll look again.
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