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

Charles Elliott elliott.ct at verizon.net
Sun Jul 2 12:05:51 UTC 2006

Yes, the Multi-Media timer option (-M) is set.


"David J Taylor" <david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk> 
wrote in message news:9uNpg.94762$wl.82500 at text.news.blueyonder.co.uk...
> 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:
>  http://www.david-taylor.myby.co.uk/ntp/ntp-events.htm#glitch
> David

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