Re: [chrony-users] PPS-only PHC refclock

For sure, that makes sense. In my use case stable, synchronized relative time between machines is much more important than the absolute time.

In this test set up chronyc sources shows the PHC PPS-only refclock as a falseticker and synchronizes fine with the FB time server. Which is why I was wondering if it needed to be disciplined in some way to make it useful.

-Joe

On Tue, Feb 1, 2022 at 1:52 PM Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:

It would certainly improve the time differences, but would presumably not
change the accuracy of the absolute time. That would be the accuracy of your
(inital) ntp absolute time. So it would depend on what it was that you wanted
the accuracy for.

William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Tue, 1 Feb 2022, Joe Williams wrote:

> [CAUTION: Non-UBC Email]Hello list,
>
> I have a NIC that has an OCXO onboard accessible via /dev/ptp2. If I set up chrony to use it as a PPS
> refclock and have an external NTP server for wall clock time would that work and improve accuracy of my
> system clock? Would I need to discipline the PHC from system time, presumably using phc2sys?
>
> Example config:
>
> server time.facebook.com
> refclock PHC /dev/ptp2 pps
>
> Thanks!
> -Joe
>
>
>

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