[ntp:questions] Slow sychronization

Unruh unruh-spam at physics.ubc.ca
Wed Aug 19 01:00:01 UTC 2009


"Richard B. Gilbert" <rgilbert88 at comcast.net> writes:

>Ray wrote:
>> Hi All,
>> 
>> I am running a new version of the NTP daemon, version 4.2.4p6, on a Linux 
>> machine with kenel version 2.6.27.
>> 
>> When I start the daemon, the peer information shows that all the peer have a 
>> offset of about 30 milliseconds. This offset will increase to about 50 
>> milliseconds after an hour. It might take many hour to days before the 
>> offset comes down to a few milliseconds. I tried using 'iburst' on the peers 
>> to see if this would speed things up, but it made no difference.
>> 
>> Are there any settings to speed up this process? Is the a problem with this 
>> version of NTP?
>> 
>> Thanks,
>> Ray
>> --------------------- 
>> 
>> 

>The topic has been visited several times in the last year or two.  The 
>only solution I know of is to let ntpd run continuously.  If, for any 
>reason, you need to shut down and reboot regularly, ntpd is probably a 
>poor choice.

>There is software available called "chrony" which provides 
>"gratification now".  I am uncertain as to whether it provides the same 
>accuracy as ntpd.

In my tests, it provides about a factor of 2 better accuracy than does
ntpd.

It runs on Linux and BSD.






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