INTEL PSTATE DRIVER

This may prevent some platform features such as thermal controls and power capping that rely on the availability of ACPI P-states information from functioning as expected, so it should be used with caution. Current value of the energy vs performance hint for the given policy or the CPU represented by it. Have site or software product issues? Email Required, but never shown. Doug Smythies 7, 3 14

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The following ihtel of shell commands can be used to enable them and see their output if the kernel is generally configured to support event tracing:. The minimum supported P-state. Sign up using Email and Password.

They are not generic scaling governors, but their names are the same as the names of some of those governors. We all know that increasing the frequency, increases a processor’s performance. The governor “performance” may decide which speed to use within this range.

The following sequence of shell commands can be used to enable them and see their output if the kernel is generally configured to support event tracing: The maximum supported non-turbo P-state. For more complete information about compiler optimizations, see our Optimization Notice.

Sign up using Email and Password. Namely, the Sandy Bridge generation of processors will never use any ;state above the last one set by software for the given core, even if it is within the turbo range, whereas all of the later processor generations will take it as a license to use any P-states from the turbo range, even above the one set by software.

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Email Required, but never shown. Email Required, but never shown. That is, it is invoked by generic scaling governors when necessary to talk to the hardware in order to change the P-state of a CPU in particular, the schedutil governor can invoke it directly pstafe scheduler context.

Linux Intel P-State vs. CPUFreq Scaling Driver/Governor Benchmarks – Phoronix

Moreover, confusingly enough, they generally do not work in the same way as the generic governors they share the names with. However, its configuration can be adjusted via sysfs to a great extent.

Sign up using Facebook. The coordination between those limits is based on the following rules, regardless of the current operation mode of the driver: Home Questions Tags Users Unanswered.

It’s running all that time anyway. Current value of the energy vs performance hint for the given policy or the CPU represented by it.

Documentation/cpu-freq/ – kernel/common – Git at Google

Ask Ubuntu works best intl JavaScript enabled. This processor state is optional. There are a host of other factors influencing runtime, such as cache size and speed, interrupts, etc. Then, the driver behaves like a regular CPUFreq scaling driver.

Maximum P-state the driver is allowed to set in percent of the maximum supported performance level the highest supported turbo Infel. They represent different energy vs performance hints and should be self-explanatory, except that default represents whatever hint value was set by the platform firmware.

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Whether or not turbo P-states are supported at all. Hi, Please see my earlier blog entries on C-states.

What exactly is a P-state? (Pt. 1)

Moreover, some processors support the Configurable TDP Thermal Design Power feature and, when that feature is enabled, the turbo threshold effectively becomes a configurable value that inteel be set by the platform firmware. This shouldn’t have any effect on the power usage of the processor.

Change the cpufreq driver from intel pstate to acpi Ask Inyel. This was the case years ago with those ancient generations old processors. Both are scaled as the P-state increases. Which of them will be in effect depends on what kernel command line options are used and on the capabilities of the processor. Specifically, if software sets the P-state of a CPU core within the turbo range that is, above the turbo thresholdthe processor is permitted to take over performance scaling control for that core and put it into turbo P-states of pstatee choice going forward.