linux-kernel - Re: acpi_idle: Very idle Core i7 machine never enters C3

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Message-ID: <20100525123905.GB7876@srcf.ucam.org>
Date:	Tue, 25 May 2010 13:39:05 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"Yu, Luming" <luming.yu@...el.com>
Cc:	Len Brown <lenb@...nel.org>, Philip Langdale <philipl@...rt.org>,
	Jeff Garrett <jeff@...rrett.org>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"venki@...gle.com" <venki@...gle.com>
Subject: Re: acpi_idle: Very idle Core i7 machine never enters C3

On Tue, May 25, 2010 at 01:59:39PM +0800, Yu, Luming wrote:

> On some platforms like NHM-EX, I was told that it's a NOP,
> But I might be given wrong information at that time when I wrote that patch.
> 
> IIRC, acpi spec just say it's optional..

Implementing it is optional, but the spec implies that it should be used 
if it's present.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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