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

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Date:	Fri, 30 Apr 2010 14:35:02 -0400
From:	Philip Langdale <philipl@...rt.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Len Brown <lenb@...nel.org>, Jeff Garrett <jeff@...rrett.org>,
	Andi Kleen <andi@...stfloor.org>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>
Subject: Re: acpi_idle: Very idle Core i7 machine never enters C3


On Fri, 30 Apr 2010 18:44:47 +0100, Matthew Garrett <mjg59@...f.ucam.org>
wrote:
> On Fri, Apr 30, 2010 at 12:25:44PM -0400, Len Brown wrote:
> 
>> I am hopeful that the "right thin to do" is to not look at bm-status
>> and that perhaps there is a bug where we are looking at it
>> "by mistake".
> 
> https://patchwork.kernel.org/patch/58962/ - it seems to be a win.

Indeed. This patch does solve the C6 problem. I'm not in a position to
speak about whether there's any undesirable I/O latency, but it
passes the basic sanity check.

I have filed https://bugzilla.kernel.org/show_bug.cgi?id=15886 with
my acpi dump - assuming that's still useful.

--phil
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