massive time drift. NTP help required

Dr. Michael J. Chudobiak mjc at
Fri Jun 1 12:32:12 UTC 2007

Mark Hutchinson wrote:
> I have a server that has a time drift of around a minute every hour.  
> Overnight, that is pretty extreme and as this is a PVR, it causes problems.
> I have NTP enabled but am still getting this drift and NTP is not 
> correcting or putting much in the logs ( no exit messages )

I had the same problem on a brand-new DC7700. ntp can only correct 
within 500 ppm (0.05%). For some reason, the DC700 clock was 1.95% too fast!

To fix this, I added this to /etc/rc.local:

/sbin/adjtimex --tick=10195

This adjusts the "tick rate" at every boot-up. Once the basic accuracy 
is corrected by this, ntp can fine-tune it exactly.

- Mike

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