[ntp:questions] ntpdate works, but ntpd doesn't (reach = 0)
unruh-spam at physics.ubc.ca
Fri Feb 13 16:27:25 UTC 2009
Martin Burnicki <martin.burnicki at meinberg.de> writes:
>> "Richard B. Gilbert" <rgilbert88 at comcast.net> writes:
>>>I'd be very cautious about using a drift file that was much more than
>>>one hour old. If the environment (temperature) has remained constant
>>>you are probably okay but the greater the length of time you are down
>>>the greater the uncertainty of the time you will start up with.
>> On Linux these days, even a drift file that is 10 sec old is useless,
>> since the system clock drift rate changes by up to 50PPM over a reboot.
>... which would not even be noticed if ntpd would initially apply
Agreed. chrony for example compensates within less than 15 min to bring the
system under control and time errors of 10s of microseconds.
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