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To: Kevin Oberman <kob6558@gmail.com>
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Comments: In-reply-to Kevin Oberman <kob6558@gmail.com>
	message dated "Wed, 21 Mar 2012 09:32:47 -0700."
Date: Thu, 22 Mar 2012 00:56:43 -0700
From: John <john@theusgroup.com>
Message-Id: <20120322075643.5530E2C9@server.theusgroup.com>
Cc: Matthias Gamsjager <mgamsjager@gmail.com>, freebsd-stable@freebsd.org
Subject: Re: powerd and increase in energy need
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>
>If you are trying to reduce power consumption, why are you limiting Cx
>states to C2 (which save little) and not C3 (which will save a LOT of
>power when the CPU is not heavily loaded).

On my previous post I forgot to set kern.hz=100. This change does lower idle
power from 71w to 62w.

With my hardware, i5-650, using C3 does not result in lower power consumption
versus C2.  Both states draw exactly the same power.

hw.acpi.cpu.cx_lowest: C3
dev.cpu.0.cx_supported: C1/3 C2/205 C3/245
dev.cpu.0.cx_lowest: C3
dev.cpu.1.cx_supported: C1/3 C2/205 C3/245
dev.cpu.1.cx_lowest: C3
dev.cpu.2.cx_supported: C1/3 C2/205 C3/245
dev.cpu.2.cx_lowest: C3
dev.cpu.3.cx_supported: C1/3 C2/205 C3/245
dev.cpu.3.cx_lowest: C3
62w idle power

hw.acpi.cpu.cx_lowest: C2
dev.cpu.0.cx_supported: C1/3 C2/205 C3/245
dev.cpu.0.cx_lowest: C2
dev.cpu.1.cx_supported: C1/3 C2/205 C3/245
dev.cpu.1.cx_lowest: C2
dev.cpu.2.cx_supported: C1/3 C2/205 C3/245
dev.cpu.2.cx_lowest: C2
dev.cpu.3.cx_supported: C1/3 C2/205 C3/245
dev.cpu.3.cx_lowest: C2
62w idle power

John Theus
TheUs Group
TheUsGroup.com