[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: NTPsec reports excessive jitter from GPSD/KPPS SHM
From: |
Gary E. Miller |
Subject: |
Re: NTPsec reports excessive jitter from GPSD/KPPS SHM |
Date: |
Mon, 9 Mar 2020 11:35:18 -0700 |
Yo Greg!
On Mon, 09 Mar 2020 12:43:07 -0400
Greg Troxel <address@hidden> wrote:
> "Nick Burkitt" <address@hidden> writes:
>
> > # GPS Serial data reference (NTP0)
> > refclock shm unit 0 refid GPS noselect
> > # GPS PPS reference (NTP1)
> > refclock shm unit 2 minpoll 3 maxpoll 3 refid PPS prefer
>
> Perhaps this is documented in gpsd, but I wonder why there is unit 0
> and unit 2, vs 1.
gpsd assigns SHM()s in pairs. The first pair is the first device
on the command line. The second pair is the second device on
the command line, etc.
The pair allows gpsd to report serial (GPS) time and PPS time
separately. If gpsd does not have two times for a device, then
only the first one is used.
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
pgp1KgS8chfDO.pgp
Description: OpenPGP digital signature
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, (continued)
- Re: NTPsec reports excessive jitter from GPSD/KPPS SHM, Greg Troxel, 2020/03/09
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/09
- Re[3]: 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, Greg Troxel, 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: NTPsec reports excessive jitter from GPSD/KPPS SHM,
Gary E. Miller <=
- 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, 2020/03/10
- Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM, Nick Burkitt, 2020/03/10