[ntp:questions] dcf77 receiver makes ntp unstable? (drift and offset get jumpy)

Folkert van Heusden folkert at vanheusden.com
Mon Feb 7 13:04:18 UTC 2005


> > When I switch on my DCF77 receiver, my ntp-server suddenly gets 
> > very unstable:
> > http://keetweej.vanheusden.com/ntp_graph.png
> > (the blue line indicates start of DCF77 receiver).
> > Running ntpq 4.2.0a at 1.1190-r on a P-III (1GHz) with Linux (2.6.9).
> 	Which DCF receiver is this?  Is it a Hopf?  If so, they're known 
> to have some serious problems.

No, it's one from "Gude":
http://www.gude.info/english/frame-mouseclock.htm
it is connected via serial port (*NOT* via serial - usb - pc!!!).
http://ntp.vanheusden.com/

> 	As for the rest, have you resolved any potential issues with 
> Linux kernel 2.6 and ACPI and APIC?

Well, things *do* run fine(!) with 2.6.9 if I disable the DCF77 receiver and
let my ntp-server only sync against ntp-servers on the net! Can it then still
be a problem related to acpi and such?


Folkert van Heusden

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