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

Documentation/cpu-freq/governors.txt

+11 −0
Original line number Diff line number Diff line
@@ -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

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

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