[ntp:questions] Re: time reset +492.958589 s

David Woolley david at djwhome.demon.co.uk
Fri Jun 17 06:47:18 UTC 2005


In article <pan.2005.06.16.20.20.29.18287 at telia.com>,
jorgen.tegner at telia.com wrote:

> Jun 16 12:16:34 burken ntpd[1834]: time reset +492.958589 s

> Can anyone suggest possible causes?

Severe clock interrupt overruns (e.g. using IDE drivers heavily on a
machine with HZ set to 1000 - see many recent articles).  Less likely,
given that it is Linux, some other software competing to set the clock.

You shouldn't be using a local clock driver on this machine as it will
reduce the ability of the protocol to signal downstream that it has
a problem.  Local drivers should always be added as the result of an
informed choice, never as a default; it is usually better not to configure
them.

In any case, you should not be using this machine as a time server
(and that is the only situation in which a local clock driver is 
sometimes a valid choice).

The hopping between remote and local clocks is perfectly reasonable,
given that it's lost so much time.



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