Hi,

I’ve got a package of OpenNTPD with the adjtimex patch applied,
but have both problems too:

• negative delays ⇒ clearly a Xen problem, only happens with
  machines in the LAN though (kind of defeats having a local
  bunch of NTP servers…)

• _positive_ adjustments work, but _negative_ (i.e. if the
  clock is ahead of time at the time ntpd is started) don’t
  (if I use (MirBSD) rdate(8) to set it, it’s kept mostly in
  line – your theory about a maximum adjustment has merit?)

Note that xen.independent_wallclock=1 and the clocksource is
jiffies for the Xen domU, tsc (mostly), hpet or acpi_pm in
other systems, but that doesn’t seem to matter EXCEPT when
changing the clocksource at run-time after ntpd has run, the
clock goes mad (so _some_ kind of adjfreq seems to have been
done).

http://www.freewrt.org/~tg/debs/dists/lenny/wtf/pkgs/openntpd/openntpd_3.9p1-7wtf8.dsc

Did you get any more information?

bye,
//mirabilos
-- 
“It is inappropriate to require that a time represented as
 seconds since the Epoch precisely represent the number of
 seconds between the referenced time and the Epoch.”
        -- IEEE Std 1003.1b-1993 (POSIX) Section B.2.2.2



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