[ntp:questions] Re: ntpd Frequency (drift) Jumps

David J Taylor david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk
Sun Jul 2 10:46:29 UTC 2006

Charles Elliott wrote:
> 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

Do you have the Multi-Media timer option set?  It was critical to getting 
good stability with my systems:



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