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

Brad Knowles brad at stop.mail-abuse.org
Mon Feb 7 11:13:38 UTC 2005

At 11:23 AM +0100 2005-02-07, Folkert van Heusden wrote:

>  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.

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

	If you have any more information regarding Linux kernel 2.6 and 
APIC/ACPI issues, please update section 8.2.3 at 
I've tried to capture information there from what I've seen on the 
mailing lists, but I'm not sure I've done it correctly, or that I've 
captured all the currently available information on this matter.  Any 
and all corrections are welcome.

Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.

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