Subject: Re: acpi timer problems?
To: None <current-users@NetBSD.org>
From: Steven M. Bellovin <firstname.lastname@example.org>
Date: 06/28/2006 11:28:37
On Mon, 26 Jun 2006 08:08:03 -0400, "Steven M. Bellovin"
> On Mon, 26 Jun 2006 14:23:53 +1000, George Michaelson <email@example.com>
> > > I think that that's Dan's point -- /var/db/ntp.drift is for state
> > > between boots. It's supposed to measure the difference over time
> > > between your machine's clock and reality, and you rarely switch
> > > clocks. It isn't supposed to compensate for the errors in your ntp
> > > peers; ntp assumes that there's One True Time, and doesn't use
> > > averaging, for example.
> > >
> > >
> > > --Steven M. Bellovin, http://www.cs.columbia.edu/~smb
> > right. so if you switch internal clock models, the ntp.drift is
> > inherently invalid, and the right thing (tm) is to junk it.
> Yes; that's what I did last night. This morning's offsets look much
> better, though I'll see what happens during the day.
After several days, it's keeping time very well, probably better than it
Again -- after switching timer type, remove your /var/db/ntp.drift file.
--Steven M. Bellovin, http://www.cs.columbia.edu/~smb