I have a high clock drift rate.

The problem is in selecting the timecounter, at least on my machine.
Both the TSC and the i8254 timecounters are checked and, since, I
believe, TSC is last, TSC is the timecounter the kernel uses.

TSC is a horrible timer, at least on my machine.  i8254 is not
perfect, but several orders of magnitude better, at least with

# sysctl -a
kern.timecounter.hardware: TSC

# sysctl -w kern.timecounter.hardware=i8264

fixes the clock drift.  Now, it is less than 2 seconds per 4 hours.
And, that is well within the range ntp can satisfactorily correct for.


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