[ntp:questions] drift file set to -500
Richard B. Gilbert
rgilbert88 at comcast.net
Tue Nov 27 02:51:38 UTC 2007
> After running NTPD on VxWorks for a couple days, the ntp.drift file
> was set to -500, that made it jump to the infinite loop trying to call
> adjtime(), but VxWorks doesn't have adjtime().
> I read the ntp documentation. It suggests to disable the time-of-year
> (TOY) clock chip. How do I disable this clock chip??
> Have anyone seen this "-500" error before? How did you resolve this?
> Any advice help,
500 PPM is the maximum frequency error that ntpd can compensate for.
Typical computer clocks exhibit an error of 25 to 100 PPM. The fact
that your drift file contains -500 strongly suggests a severe hardware
problem with your clock! How much does it lose or gain per day when
ntpd is not running?
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