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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT 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 04490C43381 for ; Sat, 2 Mar 2019 10:21:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA30420838 for ; Sat, 2 Mar 2019 10:21:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726344AbfCBKVS (ORCPT ); Sat, 2 Mar 2019 05:21:18 -0500 Received: from mga01.intel.com ([192.55.52.88]:44994 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725986AbfCBKVS (ORCPT ); Sat, 2 Mar 2019 05:21:18 -0500 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Mar 2019 02:21:17 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,431,1544515200"; d="scan'208";a="147944535" Received: from chenyu-office.sh.intel.com ([10.239.158.163]) by fmsmga002.fm.intel.com with ESMTP; 02 Mar 2019 02:21:16 -0800 Date: Sat, 2 Mar 2019 18:30:08 +0800 From: Yu Chen To: Srinivas Pandruvada Cc: "Rafael J. Wysocki" , Linux PM , LKML , Viresh Kumar , Gabriele Mazzotta Subject: Re: [RFT][PATCH 0/2] cpufreq: intel_pstate: Handle _PPC updates on global turbo disable/enable Message-ID: <20190302103008.GA7086@chenyu-office.sh.intel.com> References: <9956076.F4luUDm1Dq@aspire.rjw.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 01, 2019 at 09:39:27AM -0800, Srinivas Pandruvada wrote: > On Fri, 2019-03-01 at 13:43 +0100, Rafael J. Wysocki wrote: > > Hi All, > > > > This is how I would fix the issue reported in BZ 200759 (see this > > patch series > > from Yu too: https://marc.info/?l=linux-pm&m=155137672924029&w=2). > > > > Patch [1/2] causes intel_pstate to update all policies if it gets a > > _PPC change > > notification and sees a global turbo disable/enable change. > > > > Patch [2/2] makes it update cpuinfo.max_freq for all policies in > > those cases. > > > > The patches here have not been tested yet, so testing would be much > > appreciated. > > > > Of course, comments are welcome too! > > This is the only platform, someone reported such issue. > Can we solve this by some udev rules and offline/online cpu 1-3 on > power source change? > Sound reasonable, we can deal with this BIOS problem in user space too. But if cpu0 could not be offline, how could cpu0's policy be updated? Thanks, Yu > There are examples of changing governors on power source change. > https://bbs.archlinux.org/viewtopic.php?id=207186 > > Here instead of changing governor just > echo 0 > /sys/devices/system/cpu/cpu1/online > echo 1 > /sys/devices/system/cpu/cpu1/online > echo 0 > > /sys/devices/system/cpu/cpu2/online > echo 1 > > /sys/devices/system/cpu/cpu2/online > echo 0 > > /sys/devices/system/cpu/cpu3/online > echo 1 > > /sys/devices/system/cpu/cpu3/online > > Thanks, > Srinivas > > > > > Thanks, > > Rafael > > >