From owner-cvs-all  Tue Jan 14 17:14:36 2003
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Date: Wed, 15 Jan 2003 01:13:42 +0000
From: Josef Karthauser <joe@FreeBSD.org>
To: Peter Wemm <peter@wemm.org>
Cc: Andrew Gallatin <gallatin@cs.duke.edu>,
	John Baldwin <jhb@FreeBSD.org>, Wilko Bulte <wkb@freebie.xs4all.nl>,
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	Nate Lawson <njl@FreeBSD.org>
Subject: Re: cvs commit: src/sys/dev/acpica acpi_cpu.c
Message-ID: <20030115011342.GA5983@genius.tao.org.uk>
References: <20030114173224.A74488@grasshopper.cs.duke.edu> <20030114230057.81B422A89E@canning.wemm.org>
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On Tue, Jan 14, 2003 at 03:00:57PM -0800, Peter Wemm wrote:

>=20
> FWIW, we see a (measured) difference of about 50W on 2.2GHz P4's simply by
> turning machdep.cpu_idle_hlt on and off.  I expect the clock throttling
> would make similar differences.  For 1U rack-mount systems (especially in
> California) this is a Big Deal.
>=20

Which way's the way to reduce the power consumption?  I would guess
'machdep.cpu_idle_hlt=3D1', but as that appears to be the default I
thought I'd ask.

Joe
--=20
Josef Karthauser (joe@tao.org.uk)	       http://www.josef-k.net/
FreeBSD (cvs meister, admin and hacker)     http://www.uk.FreeBSD.org/
Physics Particle Theory (student)   http://www.pact.cpes.sussex.ac.uk/
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D An eclectic mix of fact an=
d theory. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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