Subject: Re: power management and related concerns
To: Jachym Holecek <email@example.com>
From: Steven M. Bellovin <firstname.lastname@example.org>
Date: 07/01/2006 09:15:24
On Sat, 1 Jul 2006 14:50:38 +0200, Jachym Holecek <email@example.com>
> # Steven M. Bellovin 2006-07-01:
> > On Fri, 30 Jun 2006 17:28:15 -0700, "Garrett D'Amore"
> > <firstname.lastname@example.org> wrote:
> > > Well, I've made the mistake of looking at what we currently have in
> > > NetBSD. And comparing it with some real (our) hardware.
> > >
> > > There are few quick points for discussion:
> > >
> > > [... power management (not) in NetBSD ...]
> > >
> > I've been thinking similar thoughts. I have a paper design for (what I
> > had tentatively called) envstatd. The config file would look something
> > like this:
> > acpibat0 <.04 /bin/shutdown -p now
> > temp=acpitemp >70*2 /bin/shutdown -p now
> > where the *2 indicates that it has to happen twice in a row.
> What does "twice in a row" mean? What about ">70*2m" ==> "temperature
> over 70 degC for two minutes"?
I was assuming that the daemon would be polling at some interval. Your
question is a good one that bears further thought.
Hmm -- suppose that the field was always a time -- in seconds by default,
but also accepting 2m30s or some such. (Better yet, 2:30, since that
avoids overreliance on English.) That makes the configuration file
independent of the polling interval, which is good.
--Steven M. Bellovin, http://www.cs.columbia.edu/~smb