Commit 5b95364f authored by Vishwanath BS's avatar Vishwanath BS Committed by Dave Jones

[CPUFREQ] Add documentation for sampling_down_factor

Update cpufreq governor documentation for sampling_down_factor tunable
parameter.
Signed-off-by: default avatarVishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 2feb690c
...@@ -158,6 +158,17 @@ intensive calculation on your laptop that you do not care how long it ...@@ -158,6 +158,17 @@ intensive calculation on your laptop that you do not care how long it
takes to complete as you can 'nice' it and prevent it from taking part takes to complete as you can 'nice' it and prevent it from taking part
in the deciding process of whether to increase your CPU frequency. in the deciding process of whether to increase your CPU frequency.
sampling_down_factor: this parameter controls the rate at which the
kernel makes a decision on when to decrease the frequency while running
at top speed. When set to 1 (the default) decisions to reevaluate load
are made at the same interval regardless of current clock speed. But
when set to greater than 1 (e.g. 100) it acts as a multiplier for the
scheduling interval for reevaluating load when the CPU is at its top
speed due to high load. This improves performance by reducing the overhead
of load evaluation and helping the CPU stay at its top speed when truly
busy, rather than shifting back and forth in speed. This tunable has no
effect on behavior at lower speeds/lower CPU loads.
2.5 Conservative 2.5 Conservative
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