From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arjan van de Ven Subject: Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management Date: Thu, 26 Sep 2013 08:29:39 -0700 Message-ID: <524452E3.6050200@linux.intel.com> References: <20130925231250.26184.31438.stgit@srivatsabhat.in.ibm.com> <52437128.7030402@linux.vnet.ibm.com> <20130925164057.6bbaf23bdc5057c42b2ab010@linux-foundation.org> <52442F6F.5020703@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mga01.intel.com ([192.55.52.88]:46619 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750805Ab3IZP3l (ORCPT ); Thu, 26 Sep 2013 11:29:41 -0400 In-Reply-To: <52442F6F.5020703@linux.vnet.ibm.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: "Srivatsa S. Bhat" Cc: Andrew Morton , mgorman@suse.de, dave@sr71.net, hannes@cmpxchg.org, tony.luck@intel.com, matthew.garrett@nebula.com, riel@redhat.com, srinivas.pandruvada@linux.intel.com, willy@linux.intel.com, kamezawa.hiroyu@jp.fujitsu.com, lenb@kernel.org, rjw@sisk.pl, gargankita@gmail.com, paulmck@linux.vnet.ibm.com, svaidy@linux.vnet.ibm.com, andi@firstfloor.org, isimatu.yasuaki@jp.fujitsu.com, santosh.shilimkar@ti.com, kosaki.motohiro@gmail.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, maxime.coquelin@stericsson.com, loic.pallardy@stericsson.com, amit.kachhap@linaro.org, thomas.abraham@linaro.org On 9/26/2013 5:58 AM, Srivatsa S. Bhat wrote: > Let me explain the challenge I am facing. A prototype powerpc platform that > I work with has the capability to transition memory banks to content-preserving > low-power states at a per-socket granularity. What that means is that we can > get memory power savings*without* needing to go to full-system-idle, unlike > Intel platforms such as Sandybridge. btw this is not a correct statement even Sandybridge can put memory in low power states (just not self refresh) even if the system is not idle (depending on bios settings to enable this) From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f174.google.com (mail-pd0-f174.google.com [209.85.192.174]) by kanga.kvack.org (Postfix) with ESMTP id 3CA746B0032 for ; Thu, 26 Sep 2013 11:29:43 -0400 (EDT) Received: by mail-pd0-f174.google.com with SMTP id y13so1298883pdi.5 for ; Thu, 26 Sep 2013 08:29:42 -0700 (PDT) Message-ID: <524452E3.6050200@linux.intel.com> Date: Thu, 26 Sep 2013 08:29:39 -0700 From: Arjan van de Ven MIME-Version: 1.0 Subject: Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management References: <20130925231250.26184.31438.stgit@srivatsabhat.in.ibm.com> <52437128.7030402@linux.vnet.ibm.com> <20130925164057.6bbaf23bdc5057c42b2ab010@linux-foundation.org> <52442F6F.5020703@linux.vnet.ibm.com> In-Reply-To: <52442F6F.5020703@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Srivatsa S. Bhat" Cc: Andrew Morton , mgorman@suse.de, dave@sr71.net, hannes@cmpxchg.org, tony.luck@intel.com, matthew.garrett@nebula.com, riel@redhat.com, srinivas.pandruvada@linux.intel.com, willy@linux.intel.com, kamezawa.hiroyu@jp.fujitsu.com, lenb@kernel.org, rjw@sisk.pl, gargankita@gmail.com, paulmck@linux.vnet.ibm.com, svaidy@linux.vnet.ibm.com, andi@firstfloor.org, isimatu.yasuaki@jp.fujitsu.com, santosh.shilimkar@ti.com, kosaki.motohiro@gmail.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, maxime.coquelin@stericsson.com, loic.pallardy@stericsson.com, amit.kachhap@linaro.org, thomas.abraham@linaro.org On 9/26/2013 5:58 AM, Srivatsa S. Bhat wrote: > Let me explain the challenge I am facing. A prototype powerpc platform that > I work with has the capability to transition memory banks to content-preserving > low-power states at a per-socket granularity. What that means is that we can > get memory power savings*without* needing to go to full-system-idle, unlike > Intel platforms such as Sandybridge. btw this is not a correct statement even Sandybridge can put memory in low power states (just not self refresh) even if the system is not idle (depending on bios settings to enable this) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org