linux-kernel - Re: [PATCH] ACPI: make acpi

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Message-ID: <20100803070514.GA31096@basil.fritz.box>
Date:	Tue, 3 Aug 2010 09:05:14 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Len Brown <lenb@...nel.org>, Matthew Garrett <mjg59@...f.ucam.org>,
	"Yu, Luming" <luming.yu@...el.com>,
	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: [PATCH] ACPI: make acpi_idle Nehalem-aware

On Tue, Aug 03, 2010 at 08:55:14AM +0200, Pavel Machek wrote:
> On Wed 2010-07-21 17:31:27, Len Brown wrote:
> > From: Len Brown <len.brown@...el.com>
> > 
> > The BIOS exports deep C-states on modern Intel processors
> > as "C3-type" to satisfy various legacy Operating Systems.
> 
> Can you elaborate on this? I though the only difference between
> C2-type and C3-type is busmastering...

The main difference is latency.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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