[ntp:questions] NTPD can take 10 hours to achieve stability

unruh unruh at wormhole.physics.ubc.ca
Mon Apr 18 17:46:00 UTC 2011


On 2011-04-18, David L. Mills <mills at udel.edu> wrote:
> C.,
>
> It doesn't take ten hours; it takes five/ten minutes. See the online 
> documentation release notes for recent NTP development versions at 
> www.ntp.org.

I must admit I tested an earlier version and I am glad that things are
improving. 
However, do the following test. While ntpd is running, use adjtimex to
change the system clock rate by say 20PPM. Watch the errors and see how
long it takes to settle down to the original accuracy. 


>
> Dave
>
> C BlacK wrote:
>
>>Why would it take ntpd ten hours to achieve its accuracy?  Can this be explained in laymans terms and
>>mathematically
>>
>>
>>
>>  
>>
>>>>Absolutely normal!  NTPD can sometimes need up to ten hours to achieve 
>>>>the accuracy it is capable of.
>>>>
>>>>      
>>>>
>>
>>_______________________________________________
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>>  
>>




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