[ntp:questions] ntpdate works, but ntpd doesn't (reach = 0)

Martin Burnicki martin.burnicki at meinberg.de
Fri Feb 13 11:27:26 UTC 2009


Unruh wrote:
> "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
corrections faster.

Martin
-- 
Martin Burnicki

Meinberg Funkuhren
Bad Pyrmont
Germany




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