From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932640AbbENLXN (ORCPT ); Thu, 14 May 2015 07:23:13 -0400 Received: from mail.skyhub.de ([78.46.96.112]:56945 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750759AbbENLXJ (ORCPT ); Thu, 14 May 2015 07:23:09 -0400 Date: Thu, 14 May 2015 13:23:03 +0200 From: Borislav Petkov To: Huang Rui Cc: Len Brown , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Fengguang Wu , Aaron Lu , Tony Li , Thomas Gleixner Subject: Re: Mwait usage on AMD processors Message-ID: <20150514112303.GC29125@pd.tnic> References: <20150514065451.GA29830@hr-slim.amd.com> <20150514092137.GA29235@pd.tnic> <20150514101727.GA6552@hr-slim.amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20150514101727.GA6552@hr-slim.amd.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 14, 2015 at 06:17:28PM +0800, Huang Rui wrote: > At current processors, MWAITX cannot go to C1 state, but has faster > waiting exit speed. MWAITX is still at C0 but less power consumption. > So for now, I just want to set it optionally. > HW designer will do deeper low power state (C1, and more) in future > processors. At that time, we can enable it by default. The only thing that matters IMO is which brings more power savings. If C1E is still better, we should keep it the default. We can still use MWAITX if someone boots with idle=mwait, as you say. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --