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Re: [gpsd-dev] Clarifications needed for the time-service HOWTO
From: |
Eric S. Raymond |
Subject: |
Re: [gpsd-dev] Clarifications needed for the time-service HOWTO |
Date: |
Mon, 21 Oct 2013 08:00:10 -0400 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Hal Murray <address@hidden>:
>
> address@hidden said:
> > # ntptrace ntp.ubuntu.com
> > 91.189.89.199: timed out, nothing received
> > ***Request timed out
>
> > They seem to be down.
>
> No, the servers are OK. The problem is a buggy tool and/or a poor choice of
> tool. Try sntp -d xxx or ntpdate -d xxx (ntpdate is depricated)
>
> ntptrace calls ntpq which uses mode 6 packets. That's the back door for
> debugging/monitoring. It's disabled (from the outside world) on many/most
> ntpd servers that are exposed to the big/bad internet. But when it works, it
> gives text printout which is easier to parse from simple scripts.
Would you please expand this into a brief discussion of NTP diagnostic tools
for the HOWTO?
There's a new section that begins thus:
== NTPD performance tuning ==
For good time stability, you should always have at least two other
reference clocks in your ntpd.conf besides your GPS - in case, for
example, your GPS is temporarily unable to achieve satellite lock.
TODO: more on performance tuning and diagnostics here.
This is where we need to talk about (a) adusting fudges, and (b) how
to check the quality of your chimers.
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, (continued)
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, 2013/10/21
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO,
Eric S. Raymond <=
- 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, Gary E. Miller, 2013/10/21
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/23
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Andy Walls, 2013/10/23
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/24
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, Eric S. Raymond, 2013/10/22
Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Gary E. Miller, 2013/10/22
Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Beat Bolli, 2013/10/22
Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/22