[ntp:questions] Re: hardpps error

Ulrich Windl Ulrich.Windl at RZ.Uni-Regensburg.DE
Mon Feb 2 15:15:07 UTC 2004


"Xuehuan Li" <libryant at hotmail.com> writes:

> i use motorola m12 card and pc running linux to found my ntp
> server. on one pc with linux 2.4.20-nano running on a pentium 166 mmx,
> there are many error like these:
> 
> hardpps: bad pulse, delta = -9476359 ns
> hardpps: bad pulse, delta = -9476413 ns
> hardpps: new frequency 885742 >> 2 == 221435
> hardpps: new pps.freq=221435 (add 22487)
> hardpps: bad pulse, delta = -9866147 ns
> hardpps: PPSJITTER: jitter=9866147, limit=9861568

This is either the initial loop to configure the frequency (all are
debug messages BTW), or a very unstable condition of either system
clock or PPS.

Regards,
Ulrich

> 
> while the filtoffset is up to hundreds and very unstable.
> i am sure the m12 card is a good one because it work perfect on
> another pc running the same kernel and the same ntpd.
> it's that means the pc's clock onboard is too bad to be used as an ntp
> server?
> 
> bryant
> 
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