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Re: NTPsec reports excessive jitter from GPSD/KPPS SHM
From: |
Gary E. Miller |
Subject: |
Re: NTPsec reports excessive jitter from GPSD/KPPS SHM |
Date: |
Tue, 10 Mar 2020 11:56:46 -0700 |
Yo Paul!
On Tue, 10 Mar 2020 11:52:45 -0700
Paul Theodoropoulos via <address@hidden> wrote:
> On 3/10/20 11:40, Gary E. Miller wrote:
> > Yo Nick!
> >
> > On Tue, 10 Mar 2020 18:15:27 +0000
> > "Nick Burkitt" <address@hidden> wrote:
> >
> >> I think it's time to stick a fork in this one.
> > Almost. A few things still hanging.
> >
> > You still have this near the top of your ntp.conf:
> >
> > # GPS Serial data reference (NTP0)
> > refclock shm unit 0 refid GPS noselect
> >
> > It should be after all your other time sources.
> Question - if the GPS refclock is noselect, shouldn't that mitigate
> the necessity to have it at the bottom of the list?
Yeah, mostly, but many people do not want the GPS refclock to be
noselect.
For example, if you have a power outage, and on reboot your net is
still down, then the PPS can not work without another chimer with valid
seconds. So your NTP can not get a time. The GPS can provide the base
seconds, so avoiding that trap.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can't measure it, you can't improve it." - Lord Kelvin
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- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, (continued)
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/09
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/09
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/09
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/09
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/09
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/09
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/09
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Paul Theodoropoulos, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM,
Gary E. Miller <=
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Paul Theodoropoulos, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Paul Theodoropoulos, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/10
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/10
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/10
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/10
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Gary E. Miller, 2020/03/10