[ntp:questions] NTP not syncing

Magnus Danielson magnus at rubidium.dyndns.org
Mon Nov 4 02:00:06 UTC 2013


On 11/03/2013 06:26 PM, Magnus Danielson wrote:
> On 11/03/2013 12:43 AM, David Woolley wrote:
>> On 02/11/13 21:48, David Lord wrote:
>>
>>> Ntpd writes to its drift file and also ntp.log. The drift file
>>> is critical and is used and updated at intervals by ntpd.
>>>
>> The drift file is an optimisation.  ntpd should work without it, but
>> will take longer to acquire lock after a restart.
>>
>> What would cause more problems would be a drift file that was present,
>> but read-only, as ntpd would skip its frequency calibration and trust
>> the frozen value in that file, then suffer wild swings as it begins to
>> discover the value was wildly wrong.
> If the oscillator drifts from last drift-file write, outside of +/- 15
> ppm if I recall it, it fails to lock in again.
> It would be good if it could bail out and do normal frequency
> acquisition if that occurs.
>
> That particular "feature" have bitten hard, and was a side-consequence
> of other faults, but none-the-less.
By request from Harlan, I put this into a bug-report:
http://bugs.ntp.org/show_bug.cgi?id=2500

Hope it was clear enough.

Cheers,
Magnus


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