NTP on amd74 + powernow issues
Guido van Rooij
guido at gvr.org
Sun Apr 6 09:01:22 UTC 2008
On Sat, Apr 05, 2008 at 09:15:32AM +1100, Peter Jeremy wrote:
> On Fri, Apr 04, 2008 at 07:46:05PM +0200, Guido van Rooij wrote:
> >I've got a amd64 system where I;m using powernow. I am using th i8254
> >timecounter.
>
> I'm using ACPI-fast on amd64 without problems. i8254 should not be
> affected by PowerNow! but ACPI-fast should be listed as preferable.
> Do you have a particular reason for using the i8254?
>
> >Especially the largers resets (+10 seconds) are annoying as e.g. dovecot
> >bails out.
> >
> >Any clue on how this could be fixed?
>
> Any time resets are abnormal. There's nothing obviously wrong with
> your NTP servers. I have had problems in the past with the ntpd PLL
> saturating and demonstrating symptoms similar to what you are seeing.
>
> What does your ntp.drift contain? My guess is that it's either +500
> or -500. If this is true, I suggest you:
gvr# cat /var/db/ntpd.drift
-288.731
> - stop ntpd
> - delete ntp.drift
> - enable loopstats collection in your ntp.conf (optional)
> - run "ntptime -f 0"
> - run "/etc/rc.d/ntpdate start"
> - run "/etc/rc.d/ntpd start"
>
> This will force ntpd to re-calibrate and, hopefully, it will stabilise,
> though this can take a day or so.
Didn't work :-(
-Guido
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