And how do you know it is worse. The best way would be for you to have an even
better clock source to compare it to. Do you have that?


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 |____ un...@physics.ubc.ca
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Tue, 29 Aug 2017, Thibaut BEYLER wrote:

Thanks, this is working indeed, but should i get good results (like, not more 
than a few of micros
from my gps time) with these settings ?
Right now it is locking on PPS (*) but my clock seem worse (offset to utc) than 
when using only the
ntp server as source.


2017-08-24 17:38 GMT+02:00 Miroslav Lichvar <mlich...@redhat.com>:
      On Thu, Aug 24, 2017 at 05:18:08PM +0200, Thibaut BEYLER wrote:
      > I'm trying to synchronise chrony with a pps signal coming from a bnc 
output
      > on a gps timeserver.
      >
      > The pulses seems to arrive properly according to ppstest, but i don't
      > figure out how to combine this pulse with a ntp time source to complete 
the
      > samples (according to the documentation, it seems to be possible)
      >
      > All the exemples i see on the Internet use NMEA (which i don't think I 
have
      > out of my pps output) or another reference clock, any way to do that ?

The lock option can work only with other reference clocks. With an NTP
source you wouldn't specify the option, e.g.

server foo.example.com iburst
refclock PPS /dev/pps0

After start, chronyd will synchronize the clock to the NTP server.
This will allow the PPS refclock to complete the pulses and then it
can take over as the main time source for synchronization of the
system clock.

--
Miroslav Lichvar



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