From mboxrd@z Thu Jan 1 00:00:00 1970 From: Srinivas Pandruvada Subject: Re: [intel-pstate driver regression] processor frequency very high even if in idle Date: Wed, 30 Mar 2016 13:26:27 -0700 Message-ID: <1459369587.13525.75.camel@linux.intel.com> References: <4187911.uaFVupaTVL@vostro.rjw.lan> <1459352017.13525.45.camel@intel.com> <002401d18ab5$0bf84a30$23e8de90$@net> <1459364336.13525.69.camel@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org 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" List-Id: linux-pm@vger.kernel.org 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: > >=20 > > On Wed, 2016-03-30 at 11:50 -0700, Doug Smythies wrote: > > >=20 > > > On 2016.03.30 08:52 J=C3=B6rg Otte wrote: > > > >=20 > > > >=20 > > > > 2016-03-30 17:33 GMT+02:00 Pandruvada, Srinivas > > > > > > > a@intel.com>: > > > > >=20 > > > > >=20 > > > > > On Wed, 2016-03-30 at 13:05 +0200, Rafael J. Wysocki wrote: > > > > > >=20 > > > > > >=20 > > > > > > On Wed, Mar 30, 2016 at 12:17 PM, J=C3=B6rg Otte > > > > > .com > > > > > > >=20 > > > > > > >=20 > > > > >=20 > > > > >=20 > > > > > >=20 > > > > > >=20 > > > > > > >=20 > > > > > > >=20 > > > > > > > >=20 > > > > > > > >=20 > > > > > > > > >=20 > > > > > > > > >=20 > > > > > > > > > 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) > > > > >=20 > > > > >=20 > > > > > 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. > > >=20 > > > >=20 > > > >=20 > > > > 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. > > >=20 > > > 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. > > >=20 > > > It might be worth observing both what the intel_pstate is asking > > > for > > > and what the processor is actually doing. > > If J=C3=B6rg runs with > >=20 > > turbostat -i 1 --msr=3D0x199 > >=20 > > 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 J=C3=B6rg's setup, or we'd = have > received more reports about this issue. >=20 > Question is what that is and what really makes the difference. >=20 I think, somehow we entered performance mode from powersave by default turbostat -i 1 --msr=3D0x199 will tell us.=C2=A0 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=C2=A0=C2=A0http://vger.kernel.org/majordomo-in= fo.html