diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2016-10-20 13:37:06 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-10-21 22:17:32 +0200 |
| commit | b8b97a4252547159fa4f3f46a8aa862c401cf969 (patch) | |
| tree | 1ce6a9e2430ffc71c21f718dcd675da3084f956d /Documentation/cpu-freq | |
| parent | 185d82456edaa5a7a8c8827840b8a675c60579c0 (diff) | |
| download | lwn-b8b97a4252547159fa4f3f46a8aa862c401cf969.tar.gz lwn-b8b97a4252547159fa4f3f46a8aa862c401cf969.zip | |
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.txt | 9 |
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 |