From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754243Ab3LJP2N (ORCPT ); Tue, 10 Dec 2013 10:28:13 -0500 Received: from mail-pd0-f180.google.com ([209.85.192.180]:39300 "EHLO mail-pd0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752814Ab3LJP2J (ORCPT ); Tue, 10 Dec 2013 10:28:09 -0500 Message-ID: <52A73301.3030905@linaro.org> Date: Tue, 10 Dec 2013 23:28:01 +0800 From: Alex Shi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: Arjan van de Ven , Preeti U Murthy CC: Daniel Lezcano , Frederic Weisbecker , LAK , "tglx@linutronix.de" , "linux-kernel@vger.kernel.org" , "len.brown@intel.com" , rafael.j.wysocki@intel.com Subject: Re: questions of cpuidle References: <52A5C846.30308@linaro.org> <52A5E135.2020500@linux.vnet.ibm.com> <52A6AFD1.4010002@linaro.org> <52A72ADC.6000003@linux.intel.com> In-Reply-To: <52A72ADC.6000003@linux.intel.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/10/2013 10:53 PM, Arjan van de Ven wrote: > On 12/9/2013 10:08 PM, Alex Shi wrote: >> And for monitor/mwait idle method, seems deep c-state cpu need to keep a >> eye on memory bus. So seems the memory controller in cpu package is >> impossible to get into sleep, right? > not the memory bus > the cache coherency logic ;-) > Thanks a lot, Arjan! But in Intel c7 state, l3 cache also flushed. Are there some other unit monitor this? -- Thanks Alex