[ntp:questions] Trying to use Dimension 4 time keeper

Brian Inglis Brian.Inglis at Shaw.ca
Tue Sep 10 01:12:12 UTC 2013


On 2013-09-08 23:22, unruh wrote:
> On 2013-09-09, Brian Inglis <Brian.Inglis at SystematicSw.ab.ca> wrote:
>> On 2013-09-08 11:51, W. eWatson wrote:
>>> On 9/7/2013 9:16 PM, David Taylor wrote:
>>>> On 07/09/2013 22:38, W. eWatson wrote:
>>
>> You may want to try the latest stable NTP release 4.2.6p5 from Meinberg, for
>> ease of installation, on all three of your systems.
>> With stable connections and remote NTP servers it should get your time offset
>> within 100ms in a few hours, and within a few ms (or better depending on your
>> network and sources) over a period of about three weeks, and the drift within
>> PPB of your hardware clock over that period.
>
> ntpd is slow but not that bad. a few ms in a couple of hours. It is us
> levels that tend to take a half day or so.

We are talking about Windows here with remote network servers, not ref clocks, 
not Linux or BSD with kernel time discipline.
It takes that long on Windows (7 64 bit) with current stable ntpd and a server 
selection which does not clock hop very much. I have a year of stats and graphs 
showing that. But that is much better than previous stable (which the OP is 
currently running) where the drift wandered +/-250ppB and the offset stayed 
around the 10ms range.

>> If you are in the US, you may want to select some servers from
>> http://www.ustiming.org/?page_id=458 or http://tf.nist.gov/tf-cgi/servers.cgi
>> and keep the pool servers in ntp.conf as backup in case some of your selections
>
> Just use the pool for the accuracy he needs. (.1 sec) No need to
> overload the bigger public servers.



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