[ntp:questions] radioclk DCF doubling
Brad Knowles
brad at stop.mail-abuse.org
Tue Jul 5 23:53:14 UTC 2005
At 10:49 AM +0200 2005-07-05, Serge Bets wrote:
> Hello men,
Note that there are probably also some women on this list/group.
> Now the idea: Patch radioclkd to feed 2 SHM slots with same values from
> only 1 receiver, and declare:
>
> | server 127.127.28.0 maxpoll 6 prefer
> | fudge 127.127.28.0 time1 0.020 refid DCF1
> | server 127.127.28.1 maxpoll 10
> | fudge 127.127.28.1 time1 0.020 refid DCF2
With a refclock, I don't think that setting the minpoll/maxpoll
values has any effect. I think that those values are hard-coded.
Our issue with refclocks in the past has been that when you have a
refclock attached to your system, the maxpoll gets hard-coded at 64s
for all configured servers or peers, because the hard-code value for
refclocks over-rides any other calculated or specified value.
> Hoping this will give me low offsets *and* 2 hours autonomy. What do you
> think about this idea? Doable, good, or stupid? Is "prefer" wanted?
> Other better solutions? And am I overpricing offset in front of jitter?
IMO, you're better off configuring a LocalCLK at a higher
stratum, and letting that carry you while you wait for DCF to come
back.
--
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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