Mailinglist Archive: opensuse (1002 mails)

[Joachim Schrod <jschrod@xxxxxxx>]

Per Jessen wrote:
> Joachim Schrod wrote:
>
> It is also clear that the switching of time servers according to
> availability and quality works very well, just as it is (fairly) clear
> that Roger's problem is more of a timezone issue than an ntp ditto. 

I wasn't referring to Roger's laptop problem. That clearly seems
like a configuration error.

I referred to his goal to get robust and reliable time syncs in his
automotive IT systems, i.e., in embedded car systems with
intermittent GPS connections.

> > I had big problems in the past when ntpd decides that a time source
> > is too unreliable and either drops it, or maybe even terminates
> > itself because all time sources are too much off. 
>
> But localhost would surely always be available?

That's not the problem. If you start ntpd with only localhost, and
if a time server gets available later whose time is different by
more than 20 minutes, ntpd will terminate itself. (To be more
precise: the difference must be as large for some polls, 8 IIRC, to
get a full reach shift register of 0377. But polling is not good
for Roger's automotive IT use case and should be avoided anyhow, we
have already agreed upon that.)

        Joachim

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Joachim Schrod                          Email: jschrod@xxxxxxx
Roedermark, Germany

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