From mboxrd@z Thu Jan 1 00:00:00 1970 From: Borislav Petkov Subject: Re: 50 Watt idle power regression bisected to Linux-3.10 Date: Wed, 11 Dec 2013 17:02:10 +0100 Message-ID: <20131211160210.GA23793@pd.tnic> References: <1386732093.5964.6.camel@marge.simpson.net> <20131211113839.GF21683@pd.tnic> <20131211115239.GA21999@twins.programming.kicks-ass.net> <1386764955.12005.60.camel@marge.simpson.net> <20131211124352.GB21999@twins.programming.kicks-ass.net> <20131211134048.GH21683@pd.tnic> <20131211145655.GB4510@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Return-path: Received: from mail.skyhub.de ([78.46.96.112]:43094 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750707Ab3LKQCS (ORCPT ); Wed, 11 Dec 2013 11:02:18 -0500 Content-Disposition: inline In-Reply-To: <20131211145655.GB4510@gmail.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Ingo Molnar Cc: Peter Zijlstra , Mike Galbraith , Thomas Gleixner , Len Brown , Linux PM list , "linux-kernel@vger.kernel.org" , Jeremy Eder , x86@kernel.org 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. --