You have not said whether or not you checked your system clock for
excessive natural drift. I suggest you do that. Record the results
say at a minutes interval as a delta against a known good source.
That will enable you to check for periodic shifts as well as calculate
average drift.
There is a proceedure for calibrating the system clock at
http://ntp.isc.org/bin/view/Support/ManualCalibration
check that and and the man pages for adjtimex and hwclock.
That proceedure takes care of the adjustment as well but as a first step
you could just record the the drift.
Note - the drift recording with adjtime -u -c is against the cmos clock.
That clock may be broken, so you should keep that in mind.
you could actually go the whole hog and do the settings and forget ntp.
Hope that helps.
< snip the rest >
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