[ntp:questions] Re: is there a way to "lock" the drift frequency
Bohdan Tashchuk
tashchuk at easystreet.com
Sun Nov 16 21:48:59 UTC 2003
wayne wrote:
> This is why I'm wondering if there is a way to "lock" the drift
> frequency to always be within a certain range.
I agree with you.
I don't have problems as severe as you do, but from years of observing
ntpd supplied with easch release of FreeBSD 3.x and 4.x (not sure about
versions) I think my system would be more stable with a limiting
algorithm that is a variation of your proposal. Something like:
only change drift frequency by 1 ppm max per hour
This would avoid the occasional positive feedback I see (about 3 or 4
times a year). When this occurs, the drift file changes something like this:
-13 starting value, very close to ideal for my hardware
0
-50
100
-250
....
ntp steps time,
sometimes this fixes oscillation, sometimes I need to reboot
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