[ntp:questions] Re: PPS working or not? FreeBSD 5.4
David J Taylor
david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk.invalid
Wed Feb 1 07:57:26 UTC 2006
Eugen COCA wrote:
> I have an *identical* configuration. There no need to recompile the
> kernel ! If you have the correct connections (you have) you only need
> to put "enable pps" in the ntpd.conf file.
> Please write me on the mail dirrectly for other information.
This is what I had:
# The GPS receiver on COM1 at 4800 baud
# mode 1 = use $GPRMC statements
# time1 = trimming offset
# flag3 1 = enable Kernel PPS discipline
server 127.127.20.1 mode 1 prefer
fudge 127.127.20.1 time1 0.000 flag3 1 refid PPS
and recompiling the kernel changed the offset from looking like a typical
Internet source (few milliseconds accuracy) to a PPS source with a few
However, I see that the revision date on the ntp.conf file is /after/
recompiling. I think the only change I made was the refid, but I'm not
100% sure now.
There was a distinct difference in the output of a "ntpdc -c kern" command
before and after, as shown towards the end of this page:
More information about the questions