[ntp:questions] ntpd Frequency (drift) Jumps

Charles Elliott elliott.ct at verizon.net
Sun Jul 2 10:23:50 UTC 2006


I just started using ntpd.  It seems to be most accurate in terms of the
offset remaining in the range [-10, 10] ms when the frequency drift
is -41.xxx.  However, every now and then, for no apparent reason, the
frequency will jump +- 50 to 100 PPM.  When it does, the offset increases
greatly in magnitude, becomes wildly erratic, and ntpd adjustes the clock
frequently.  In a day or so ntpd will slowly reduce the drift to -4y.xxx, 
then
it will start the cycle again.  I am using ntpd 4.2.0b from
ntp-4.2.0b at 1.1436mbg-xmas-o-win32-setup.exe.  Has anyone else
noticed this behavior?  Do you know of a remedy?

C Elliott 





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