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Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous |
Date: |
Tue, 22 Oct 2013 10:46:43 -0700 |
Yo Eric!
On Tue, 22 Oct 2013 11:14:21 -0400
"Eric S. Raymond" <address@hidden> wrote:
> > Type 20 is Generic NMEA, but there are others (Jupiter, Oncore,
> > Palisade, etc.).
>
> Heads up, Harlan. You need to hear this.
>
> Learning that there is direct GPS support in ntpd makes me nervous.
> I recommend you take a good hard look at *removing* it.
I think this is a tad harsh. ntpd assumes the daemon is network
connected and so has a number of other sources to get data like the
current century and the leap seconds. It also has no need for position,
velocity, error estimates, sky view, etc. All ntpd really needs is the
top of the second from the PPS. Then it takes that data from the
multiple sources, applies voting rules and comes up with a best guess.
If it misses some GPS time thing then the voting will ignore the GPS
data until later it seems valid.
So if time is all you want, ntpd is the way to go.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
address@hidden Tel:+1(541)382-8588
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- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, (continued)
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Greg Troxel, 2013/10/21
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Andy Walls, 2013/10/21
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Hal Murray, 2013/10/22
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/22
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Andy Walls, 2013/10/22
- [gpsd-dev] Direct GPS support in ntpd makes me nervous, Eric S. Raymond, 2013/10/22
- Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous,
Gary E. Miller <=
- Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous, tz, 2013/10/22
- Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous, Hal Murray, 2013/10/22
- Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous, Eric S. Raymond, 2013/10/22
- Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous, Harlan Stenn, 2013/10/22
- Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous, Eric S. Raymond, 2013/10/22
- Re: [gpsd-dev] Direct GPS support in ntpd makes me nervous, Harlan Stenn, 2013/10/22
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/22
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Gary E. Miller, 2013/10/21
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Hal Murray, 2013/10/22
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/23