[ntp:questions] Slow sychronization

Unruh unruh-spam at physics.ubc.ca
Thu Nov 12 16:59:29 UTC 2009

Ulrich Windl <Ulrich.Windl at RZ.Uni-Regensburg.DE> writes:

>"Ray" <rayatnrc at hotmail.com> writes:

>> 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.


>I didn't investigate further, but I see the same effect, and I suspect
>that there is a mismatch between the kernel interface and ntpd. I'm
>running several instances of SLES10 SP2 here.

Nope. ntp simply has very slow response to errors. Its time constant is a bit over
an hour at poll level 6.
(ie it decreases the error by about a factor of 2 every hour or so, but there is
an overshoot at first.)

>> 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?

>I'd fiddle with "minpoll" ;-)

>> Thanks,
>> Ray
>> --------------------- 

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