Refer to "Intel® 64 and IA-32 Architectures Software Developer’s Manual
Volume 3: System Programming Guide" to understand ratios.
+There is one more sysfs attribute in /sys/devices/system/cpu/intel_pstate/
+that can be used for controlling the operation mode of the driver:
+
+ status: Three settings are possible:
+ "off" - The driver is not in use at this time.
+ "active" - The driver works as a P-state governor (default).
+ "passive" - The driver works as a regular cpufreq one and collaborates
+ with the generic cpufreq governors (it sets P-states as
+ requested by those governors).
+ The current setting is returned by reads from this attribute. Writing one
+ of the above strings to it changes the operation mode as indicated by that
+ string, if possible. If HW-managed P-states (HWP) are enabled, it is not
+ possible to change the driver's operation mode and attempts to write to
+ this attribute will fail.
+
cpufreq sysfs for Intel P-State
Since this driver registers with cpufreq, cpufreq sysfs is also presented.