linux-kernel - Re: 50 Watt idle power regression bisected to Linux-3.10

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Message-ID: <20131211160210.GA23793@pd.tnic>
Date:	Wed, 11 Dec 2013 17:02:10 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <bitbucket@...ine.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jeremy Eder <jeder@...hat.com>, x86@...nel.org
Subject: Re: 50 Watt idle power regression bisected to Linux-3.10

On Wed, Dec 11, 2013 at 03:56:55PM +0100, Ingo Molnar wrote:
> I think CLFLUSH should be pretty universally available, IIRC
> graphics drivers were using it rather heavily in combination with
> write-combining MTRRs, both on Linux and on Windows.

... and it is also very expensive. So I don't think it would be in
Intel's best interest to do CLFLUSH unconditionally on all families but
only on those which really need to.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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