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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2016-10-20 13:37:06 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-10-21 22:17:32 +0200
commitb8b97a4252547159fa4f3f46a8aa862c401cf969 (patch)
tree1ce6a9e2430ffc71c21f718dcd675da3084f956d /Documentation/cpu-freq
parent185d82456edaa5a7a8c8827840b8a675c60579c0 (diff)
downloadlinux-b8b97a4252547159fa4f3f46a8aa862c401cf969.tar.bz2
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 <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/cpu-freq')
-rw-r--r--Documentation/cpu-freq/intel-pstate.txt9
1 files changed, 5 insertions, 4 deletions
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