1. compile a kernel with "options NTP" turned on. This makes a big 
difference. This should not be an option any more.

2. make sure /var/db/ntp.drift exists (this is the canonical place 
for it in 1.4.2 and 1.5 (to come)). xntpd will write to this every 
hour if there is a directive:

	driftfile	/var/db/ntp.drift

in /etc/ntp.conf

3. make sure your peers (servers, whatever) are topologically close - 
in particular it is very bad to have an asymmetric path between you 
(takes longer one way than to go back, or vice versa) because this 
hoses the adjustment that xntpd makes to timestamps from peers.

	Erik <fair@clock.org>