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Re: [gpsd-dev] Clarifications needed for the time-service HOWTO
From: |
Miroslav Lichvar |
Subject: |
Re: [gpsd-dev] Clarifications needed for the time-service HOWTO |
Date: |
Thu, 24 Oct 2013 11:44:47 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Oct 23, 2013 at 11:40:20AM -0400, Eric S. Raymond wrote:
> Miroslav Lichvar <address@hidden>:
> > > Note that a chimer can be a poor performer (what the inventor of NTP
> > > whimsically calls a "falseticker") for either of two reasons. It may
> > > be shipping bad time, or the best routes between you and it have large
> > > latency variations. (Large but fixed latencies can be compensated out
> > > using a fudge.)
> >
> > A source will be marked as falseticker only if it serves bad time or
> > is outvoted by multiple sources with incorrect time, not when the
> > delay is large or asymmetrical, because the large delay is included in
> > the intervals used in the NTP source selection algorithm.
>
> I wasn't talking about large or asymmetrical but *variable*. Are we
> really disagreeing here?
I'm just suggesting to remove "(what the inventor of NTP whimsically
calls a "falseticker")" from that text. A falseticker is a source that
doesn't agree with other sources, large jitter doesn't imply that.
The last sentence in the paragraph should possibly be removed too.
I don't think there is a fudge option to compensate for an asymmetry
in the network delay. Large symmetric delays are not a problem.
--
Miroslav Lichvar
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, (continued)
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Gary E. Miller, 2013/10/24
- 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, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Harlan Stenn, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Hal Murray, 2013/10/25
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Harlan Stenn, 2013/10/25
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/25
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Greg Troxel, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Harlan Stenn, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Eric S. Raymond, 2013/10/25
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO,
Miroslav Lichvar <=
- 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, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Harlan Stenn, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Gary E. Miller, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Gary E. Miller, 2013/10/24
- Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Harlan Stenn, 2013/10/24
Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Gary E. Miller, 2013/10/23