Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754931AbcC3U0T (ORCPT ); Wed, 30 Mar 2016 16:26:19 -0400 Received: from mga09.intel.com ([134.134.136.24]:34649 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754657AbcC3U0M (ORCPT ); Wed, 30 Mar 2016 16:26:12 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,418,1455004800"; d="scan'208";a="774922960" Message-ID: <1459369587.13525.75.camel@linux.intel.com> Subject: Re: [intel-pstate driver regression] processor frequency very high even if in idle From: Srinivas Pandruvada To: "Rafael J. Wysocki" Cc: Doug Smythies , =?ISO-8859-1?Q?J=F6rg?= Otte , Linux Kernel Mailing List , "linux-pm@vger.kernel.org" , "Rafael J. Wysocki" Date: Wed, 30 Mar 2016 13:26:27 -0700 In-Reply-To: References: <4187911.uaFVupaTVL@vostro.rjw.lan> <1459352017.13525.45.camel@intel.com> <002401d18ab5$0bf84a30$23e8de90$@net> <1459364336.13525.69.camel@linux.intel.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.5.1 (3.18.5.1-1.fc23) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2972 Lines: 91 On Wed, 2016-03-30 at 22:12 +0200, Rafael J. Wysocki wrote: > On Wed, Mar 30, 2016 at 8:58 PM, Srinivas Pandruvada > wrote: > > > > On Wed, 2016-03-30 at 11:50 -0700, Doug Smythies wrote: > > > > > > On 2016.03.30 08:52 Jörg Otte wrote: > > > > > > > > > > > > 2016-03-30 17:33 GMT+02:00 Pandruvada, Srinivas > > > > > > > a@intel.com>: > > > > > > > > > > > > > > > On Wed, 2016-03-30 at 13:05 +0200, Rafael J. Wysocki wrote: > > > > > > > > > > > > > > > > > > On Wed, Mar 30, 2016 at 12:17 PM, Jörg Otte > > > > > .com > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 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. > > > > > > > > > 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) > > > > > > > > > > > > > > > I want to reproduce this if I can. Can you give us info about > > > > > your > > > > > setup (Linux distribution, laptop model etc.)? > > > I would like to try to reproduce the issue also. > > > > > > > > > > > > > > > Distro: Ubuntu 14.04.4 LTS > > > Note that with Ubuntu 14.04, I had issues where my CPU > > > would lock at pstate 24 (not always 24, but usually), > > > regardless of load. > > > However, it was always after an S3 suspend, occurred 100% > > > of the time, and was independent of intel_pstate or > > > acpi-cpufreq CPU frequency scaling drivers. > > > > > > Since changing my test server to Ubuntu server edition 16.04 > > > (development version), I have not had those issues. While I have > > > no proof, I have assumed the issue elimination was somehow > > > related > > > to the change to systemd. > > > > > > It might be worth observing both what the intel_pstate is asking > > > for > > > and what the processor is actually doing. > > If Jörg runs with > > > > turbostat -i 1 --msr=0x199 > > > > We can tell whether if we requested or the same problem you had. > > I tried on Ubuntu LTS 14.04 on same Haswell CPU model, I didn't see > > this issue. > There seems to be something odd about the Jörg's setup, or we'd have > received more reports about this issue. > > Question is what that is and what really makes the difference. > I think, somehow we entered performance mode from powersave by default turbostat -i 1 --msr=0x199 will tell us.  Thanks, Srinivas > Thanks, > Rafael > -- > To unsubscribe from this list: send the line "unsubscribe linux-pm" > in > the body of a message to majordomo@vger.kernel.org > More majordomo info at  http://vger.kernel.org/majordomo-info.html