From b8b97a4252547159fa4f3f46a8aa862c401cf969 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Thu, 20 Oct 2016 13:37:06 -0700 Subject: Documentation: intel_pstate: PID tuning is not always available 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 Signed-off-by: Rafael J. Wysocki --- Documentation/cpu-freq/intel-pstate.txt | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'Documentation/cpu-freq') diff --git a/Documentation/cpu-freq/intel-pstate.txt b/Documentation/cpu-freq/intel-pstate.txt index e6bd1e6512a5..5528d6d59687 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 -- cgit v1.2.3