[ntp:questions] PPS not working on newer kernel/distros

Vitezslav Samel vitezslav at samel.cz
Mon Oct 15 05:51:53 UTC 2018


On Sun, Oct 14, 2018 at 05:59:49PM -0400, Brandon Applegate wrote:
> On Oct 14, 2018, at 4:22 PM, Brandon Applegate <brandon at burn.net> wrote:
> > What I’m experiencing is that it will run with flag3 set to 1 - but
> > it never seems to ‘lock on’ to PPS.  I’m wondering / asking if this
> > could be a kernel issue.  I know I’m not giving kernel versions etc.
> > and I’m speaking in terms of linux distro version.  I suppose I
> > could nail down versions and try to dig to see if there’s PPS
> > changes that have been made (for the worse) over the years.  I was
> > just hoping perhaps someone on this list would know offhand of a
> > ’smoking gun’ WRT linux kernel version / changes that has
> > (adversely) affected kernel PPS.
> Well it might seem that I was a bit hasty - and didn’t give ntpd time
> enough to sync on PPS.  In the past this was a very rapid process.
> Since I’ve reinstalled and rebuilt it certainly takes longer.  I’ve
> set flag 3 to 1 and it did sync on PPS (‘o’ in billboard).  It seems
> to be settling down now.

  To see if you are using kernel PPS use 'ntpq -c kerninfo' and search
for line starting with 'kernel status:'

in case of userspace PPS:

	kernel status:         pll nano

in case of kernel PPS:

	kernel status:         pll ppsfreq ppstime ppssignal nano


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