--- Documentation/cpu-freq/governors.txt

+++ Documentation/cpu-freq/governors.txt

@@ -28,6 +28,7 @@ Contents:

2.3 Userspace

2.4 Ondemand

2.5 Conservative

+2.6 Interactive

3. The Governor Interface in the CPUfreq Core

@@ -182,6 +183,27 @@ governor but for the opposite direction.

default value of '20' it means that if the CPU usage needs to be below

20% between samples to have the frequency decreased.

+2.6 Interactive

+---------------

+

+The CPUfreq governor "interactive" is designed for low latency,

+interactive workloads. This governor sets the CPU speed depending on

+usage, similar to "ondemand" and "conservative" governors. However

+there is no polling, or 'sample_rate' required to scale the CPU up.

+

+Sampling CPU load every X ms can lead to under powering the CPU

+for X ms, leading to dropped framerate, stuttering UI etc..

+

+Scaling the CPU up is done when coming out of idle, and like "ondemand"

+scaling up will always go to MAX, then step down based off of cpu load.

+

+There is only one tuneable value for this governor:

+

+min_sample_time: The ammount of time the CPU must spend (in uS)

+at the current frequency before scaling DOWN. This is done to

+more accurately determine the cpu workload and the best speed for that

+workload. The default is 50ms.

+

3. The Governor Interface in the CPUfreq Core

=============================================