From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [PATCH 0/6] cpufreq: Add sampling window to enhance ondemand governor power efficiency Date: Thu, 23 Dec 2010 14:42:20 +0000 Message-ID: <20101223144220.GB1402@srcf.ucam.org> References: <1293085424-18212-1-git-send-email-youquan.song@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from cavan.codon.org.uk ([93.93.128.6]:42453 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752822Ab0LWOme (ORCPT ); Thu, 23 Dec 2010 09:42:34 -0500 Content-Disposition: inline In-Reply-To: <1293085424-18212-1-git-send-email-youquan.song@intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Youquan Song Cc: davej@redhat.com, cpufreq@vger.kernel.org, venki@google.com, arjan@linux.intel.com, lenb@kernel.org, suresh.b.siddha@intel.com, kent.liu@intel.com, chaohong.guo@intel.com, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Youquan Song We've generally been assuming (rightly or wrongly) that getting into deep C states is preferable to being active (even at a lower frequency), and so the current behaviour of tending to rapidly switch to the maximum P state isn't inherently a problem. What kind of power savings are you benchmarking with this, and do you still see a saving if you just disable turbo mode? -- Matthew Garrett | mjg59@srcf.ucam.org