From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77971C65BAE for ; Thu, 13 Dec 2018 12:41:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2BD542086D for ; Thu, 13 Dec 2018 12:41:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2BD542086D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729246AbeLMMlo (ORCPT ); Thu, 13 Dec 2018 07:41:44 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:34621 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729116AbeLMMlo (ORCPT ); Thu, 13 Dec 2018 07:41:44 -0500 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id C59BF201353429; Thu, 13 Dec 2018 13:41:40 +0100 (CET) Subject: Re: intel_pstate: Lowest frequency not reached with Intel i7-6700 To: "Rafael J. Wysocki" Cc: Doug Smythies , linux-pm@vger.kernel.org, LKML , Srinivas Pandruvada , Len Brown References: <000701d4926f$533eb270$f9bc1750$@net> From: Paul Menzel Message-ID: Date: Thu, 13 Dec 2018 13:41:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms060400060302000004090807" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms060400060302000004090807 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Rafael, On 12/13/18 11:39, Rafael J. Wysocki wrote: > On Thu, Dec 13, 2018 at 10:54 AM Paul Menzel wr= ote: >> On 12/13/18 00:06, Doug Smythies wrote: >>> On 2018.12.12 13:40 Paul Menzel wrote: >>> >>>> Using *powersave* as P-state selection algorithm, on an idle system >>> >>> Define "idle system". >>> If your computer is running a GUI, or is even a server without a GUI >>> but with many services running, then "idle" really isn't. >>> Below is from my test server, with many services disabled, so >>> "idle" really is quite "idle" >>> >>> doug@s15:~/temp$ sudo turbostat --Summary --quiet --show Busy%,Bzy_MH= z,PkgTmp,PkgWatt --interval 15 >>> Busy% Bzy_MHz PkgTmp PkgWatt >>> 0.01 1608 27 3.71 >>> 0.01 1619 27 3.71 >>> 0.01 1600 28 3.71 >>> 0.01 1600 28 3.70 >>> >>> Note that p state 16 (1600 MHz) is the minimum for my older i7-2600k >>> processor. >> >> The thing is, on an Intel Kaby Lake laptop with Ubuntu 18.10 and GNOME= >> running, it goes down to the lowest listed frequency. Checking the numbers again, I was mistaken. The lowest possible frequency= of the Intel Kaby Lake i7-7500U in that laptop is 400 MHz, and it is going down to 600 MHz. Busy% from turbostat is 0.3 to 0.4. > Kaby Lake has hardware-managed P-states (HWP) which is a different mech= anism. Isn=E2=80=99t HWP also available for the 6th generation? $ dmesg | grep intel_pstate [ 2.092456] intel_pstate: Intel P-state driver initializing [ 2.094820] intel_pstate: HWP enabled >>>> Shouldn=E2=80=99t it go down until 800 MHz? >>> >>> We would need some actual busy information, turbostat is the >>> recommended tool, to know for sure. >> >> Here you go. >> >> ``` >> tools/power/x86/turbostat> sudo ./turbostat --Summary --quiet --show B= usy%,Bzy_MHz,PkgTmp,PkgWatt --interval 15 >> Busy% Bzy_MHz PkgTmp PkgWatt >> 3.59 1167 31 1.68 >> 3.21 903 31 1.34 >> 3.21 906 31 1.34 >> 3.27 901 31 1.35 >> 8.23 2715 30 2.32 =E2=86=90 stopping GDM (systemctl stop gdm= ) >> 2.95 915 30 1.18 >> 2.91 906 30 1.18 >> 2.92 903 30 1.17 >> 2.90 900 29 1.17 >> 2.89 903 29 1.18 >> 2.91 903 30 1.18 >> 2.89 903 29 1.18 >> 2.89 900 29 1.18 >> 2.90 903 30 1.18 >> 2.90 903 29 1.17 >> 2.90 903 29 1.17 >> 2.90 900 29 1.16 >> 2.90 903 29 1.14 >> 2.90 903 28 1.11 >> 2.90 903 29 1.10 >> 2.91 900 29 1.16 >> 2.91 903 29 1.14 >> 2.90 903 29 1.12 >> 2.90 903 29 1.16 >> 2.90 900 28 1.17 >> 2.92 903 29 1.16 >> 2.90 903 29 1.16 >> 2.90 903 29 1.16 >> ``` >> >> 800 MHz should be enough to keep GDM running, shouldn=E2=80=99t it? >=20 > Well, depending. >=20 >> Otherwise only SSH was running. >=20 > There obviously is something that causes it to stay at 900 MHz. It=E2=80=99s not obvious to me, but you have more experience. It=E2=80=99= d expect to at least one core(?) to go down to 800 MHz and not all to stay at 900 MHz. > Please check max_perf_pct, min_perf_pct and num_pstates under > /sys/devices/system/cpu/intel_pstate/ . /sys/devices/system/cpu/intel_pstate> cat max_perf_pct min_perf_pct n= um_pstates 100 20 33 > Also cpuinfo_max_freq, cpuinfo_min_freq, scaling_max_freq, > scaling_min_freq under /sys/devices/system/cpu/cpufreq/policy0/ . /sys/devices/system/cpu/cpufreq/policy0> cat cpuinfo_{min,max}_freq scali= ng_{min,max}_freq 800000 4000000 800000 4000000 > However, please note that Busy% of 3 isn't particularly low. Indeed. On the laptop it is around 0.3 to 0.4 even with GNOME running. So, to check if everything is working, I boot into initramfs and check the numbers there? 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