Subject: Re: Why I wanted to tweak tickadj
To: None <mouse@Collatz.McRCIM.McGill.EDU>
From: Charles M. Hannum <email@example.com>
Date: 12/06/1994 12:28:40
It may not be, in general. In my case, I had an adjustment large
enough that I didn't want to wait for the slow one-or-two-percent slew
tickadj tends to use; I cranked tickadj up until the machine's
time-of-day was ticking off seconds nearly twice as fast as my watch.
There's a good reason for `ntpdate' being in the xntp distribution.
In general, you should run it before you start xntpd.
One thing on my
it-would-be-nice-to-do-someday list is to look at extending things so
that the clock tick size is kept in units much smaller than
microseconds (perhaps 2^-32 usec) so that it can be adjusted to very
fine precision, to match observed effective clock tick rates quite
There's a piece of code in recent xntpd distributions that's supposed
to simulate a phase locked loop. Supposedly after the PLL settles it
keeps very precise time. I haven't tried it.