Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757949AbcC2Rcb (ORCPT ); Tue, 29 Mar 2016 13:32:31 -0400 Received: from mail-vk0-f53.google.com ([209.85.213.53]:32846 "EHLO mail-vk0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757871AbcC2Rc2 convert rfc822-to-8bit (ORCPT ); Tue, 29 Mar 2016 13:32:28 -0400 MIME-Version: 1.0 In-Reply-To: References: Date: Tue, 29 Mar 2016 19:32:27 +0200 Message-ID: Subject: Re: [intel-pstate driver regression] processor frequency very high even if in idle From: =?UTF-8?Q?J=C3=B6rg_Otte?= To: Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 892 Lines: 25 2016-03-29 19:24 GMT+02:00 Jörg Otte : > in v4.5 and earlier intel-pstate downscaled idle processors (load > 0.1-0.2%) to minumum frequency, in my case 800MHz. > > Now in v4.6-rc1 the characteristic has dramatically changed. If in > idle the processor frequency is more or less a few MHz around 2500Mhz. > This is the maximum non turbo frequency. > > No difference between powersafe or performance governor. > > I currently use acpi_cpufreq which works as usual. > > Processor: > Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz (family: 0x6, model: 0x3c, > stepping: 0x3) > > Last known good kernel is: 4.5.0-01127-g9256d5a > First known bad kernel is: 4.5.0-02535-g09fd671 > > There is > commit 277edba Merge tag 'pm+acpi-4.6-rc1-1' of > git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm > in between, which brought a few changes in intel_pstate. > > thanks, Jörg