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Documentation: intel_pstate: PID tuning is not always available

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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 <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Srinivas Pandruvada 2016-10-20 13:37:06 -07:00 • committed by Rafael J. Wysocki
commit b8b97a4252
1 changed files with 5 additions and 4 deletions
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9
Documentation/cpu-freq/intel-pstate.txt
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@ -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