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Date: Sun, 12 Sep 2010 19:20:07 +0900
From: Norikatsu Shigemura <nork@FreeBSD.org>
To: Alexander Motin <mav@FreeBSD.org>
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Cc: FreeBSD-Current <freebsd-current@FreeBSD.org>, nork@FreeBSD.org
Subject: Re: CPU C-state storange on Panasonic TOUGH BOOK CF-R9
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Hi mav.

On Sun, 12 Sep 2010 13:00:22 +0300
Alexander Motin <mav@FreeBSD.org> wrote:
> `sysctl -a` is a bad tool to estimate C-states usage. It causes a lot of
> context switches, making data dirty. To get more precise data, try:
> sysctl hw.acpi.cpu.cx_lowest=C2 && sleep 10 && sysctl dev.cpu.0.cx_usage
> dev.cpu.1.cx_usage dev.cpu.2.cx_usage dev.cpu.3.cx_usage

	I tried, got following results:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# sysctl hw.acpi.cpu.cx_lowest=C2 && sleep 10 && sysctl dev.cpu.0.cx_usage dev.cpu.1.cx_usage dev.cpu.2.cx_usage dev.cpu.3.cx_usage
hw.acpi.cpu.cx_lowest: C3 -> C2
dev.cpu.0.cx_usage: 2.37% 97.62% last 3028us
dev.cpu.1.cx_usage: 0.87% 99.12% last 4379us
dev.cpu.2.cx_usage: 0.54% 99.45% last 14314us
dev.cpu.3.cx_usage: 1.36% 98.63% last 16982us

# sysctl hw.acpi.cpu.cx_lowest=C2 && sleep 10 && sysctl dev.cpu.0.cx_usage dev.cpu.1.cx_usage dev.cpu.2.cx_usage dev.cpu.3.cx_usage
hw.acpi.cpu.cx_lowest: C2 -> C2
dev.cpu.0.cx_usage: 1.82% 98.17% last 2672us
dev.cpu.1.cx_usage: 0.71% 99.28% last 3413us
dev.cpu.2.cx_usage: 0.00% 100.00% last 13543us
dev.cpu.3.cx_usage: 2.00% 97.99% last 16190us
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	That's perfect!

	Thank you.

-- 
Norikatsu Shigemura <nork@FreeBSD.org>