[LinuxPPS] refclock_nmea patch

[Johan Bejeryd]

   Yes,

> that's the experience. But: it's no must have. With 2.6.19 the
> kernel/time/ntp.c changed into it's "modern" shape. I got this (very) slow
> ntp behavior after reboot first (ntpd was running before and in good
> shape) see
>
> http://www.schiffner-limbach.de/ntp/ntp_logs_061210.png
> http://lkml.org/lkml/2007/1/10/75
>
> Somesimes it happens, sometime not.
> In general now ntp is slower then it was before. I have had a look at the
> sources but couldn't chatch the reason / difference.
>
> Johan, if you could collect some data more about this please?
> If this happens in a repeatable way, it makes IMHO sense to start a
> discussion with the ntp-people (linux and others) about the time a ntpd
> (with PPS!) is allowed to catch-up.
> In an embedded environment it makes no sense to have PPS but adjustment
> takes half a day.
>
> Bernhard
>
> (The diagram was generated by gnuplot with a little script around. Want to
> see it?)



Thanks for the reply,

I'll try to record some data for several runs.  It would  be nice to see the
script.

/Johan






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