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Date: Sun, 6 Apr 2008 17:24:07 +0200
From: Guido van Rooij <guido@gvr.org>
To: Jeremy Chadwick <koitsu@freebsd.org>
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Cc: David Malone <dwmalone@maths.tcd.ie>, freebsd-stable@freebsd.org
Subject: Re: NTP on amd74 + powernow issues
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On Sat, Apr 05, 2008 at 03:58:03AM -0700, Jeremy Chadwick wrote:
> On Sat, Apr 05, 2008 at 11:13:49AM +0200, Guido van Rooij wrote:
> > On Fri, Apr 04, 2008 at 08:42:38PM +0100, David Malone 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 keep getting time resets from ntp:
> > > 
> > > I don't think the i8254 should be effected by the i8254. Are there
> > > any other choices listed under kern.timecounter.choice? I have one
> > > amd64 machine running powerd to control the powernow stuff and it
> > > works OK with the ACPI timer.
> > 
> > Nope:
> > kern.timecounter.choice: TSC(800) i8254(0) dummy(-1000000)
> > 
> > IIRC I couldn't boot at all with acpi, so I disabled it.
> 
> ACPI-fast should address the problem you're seeing with NTP drift.
> 
> It would then be best to figure out why your machine won't boot with
> ACPI enabled.
> 

This lead to a panic as is described here:
http://bsd.haofood.net/2005/11/21/work-around-for-busted-rs-acpi-long/

The panic occurs because a \0 is in the namespace. It was suggested
to fix the problem by overwriting \0 with X or _ when loading the 
acpi tables.

This has not been fixed and there is no bios update for the motherboard...

-Guido