From mboxrd@z Thu Jan 1 00:00:00 1970 From: Srinivas Pandruvada Subject: [PATCH 2/2] Documentation: intel_pstate: PID tuning is not always available Date: Thu, 20 Oct 2016 13:37:06 -0700 Message-ID: <1476995826-15536-3-git-send-email-srinivas.pandruvada@linux.intel.com> References: <1476995826-15536-1-git-send-email-srinivas.pandruvada@linux.intel.com> Return-path: Received: from mga07.intel.com ([134.134.136.100]:13746 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755335AbcJTUhW (ORCPT ); Thu, 20 Oct 2016 16:37:22 -0400 In-Reply-To: <1476995826-15536-1-git-send-email-srinivas.pandruvada@linux.intel.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: rjw@rjwysocki.net Cc: linux-pm@vger.kernel.org, Srinivas Pandruvada PID tuning is not available when the get_target_pstate_use_cpu_load() is used to calculate target_state. So update the documentation. Signed-off-by: Srinivas Pandruvada --- Documentation/cpu-freq/intel-pstate.txt | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/Documentation/cpu-freq/intel-pstate.txt b/Documentation/cpu-freq/intel-pstate.txt index e6bd1e6..5528d6d 100644 --- a/Documentation/cpu-freq/intel-pstate.txt +++ b/Documentation/cpu-freq/intel-pstate.txt @@ -122,11 +122,12 @@ will run at is selected by the processor itself. Tuning Intel P-State driver -When HWP mode is not used, debugfs files have also been added to allow the -tuning of the internal governor algorithm. These files are located at -/sys/kernel/debug/pstate_snb/. The algorithm uses a PID (Proportional -Integral Derivative) controller. The PID tunable parameters are: +When the performance can be tuned using PID (Proportional Integral +Derivative) controller, debugfs files are provided for adjusting performance. +They are presented under: +/sys/kernel/debug/pstate_snb/ +The PID tunable parameters are: deadband d_gain_pct i_gain_pct -- 2.7.4