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doc: add intel_pstate in power management

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With the addition of the patchset to allow auto-detection and use
of the intel_pstate kernel driver instead of the acpi-cpufreq kernel
driver, we need to reflect this in the documentation.

Now, instead of telling the user to disable intel_pstate in all cases,
it is now an optional step, should the user want to use acpi-cpufreq.

Signed-off-by: David Hunt <david.hunt@intel.com>
Acked-by: Marko Kovacevic <marko.kovacevic@intel.com>
This commit is contained in:
David Hunt 2019-01-15 14:17:00 +00:00 committed by Thomas Monjalon
parent fa77f80f49
commit b7eaf5bb5a
2 changed files with 17 additions and 4 deletions
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8
doc/guides/rel_notes/release_19_02.rst
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@ -147,6 +147,14 @@ New Features
Added a new performance test tool to test the compressdev PMD. The tool tests
compression ratio and compression throughput.
* **Added intel_pstate support to Power Management library.**
Previously, using the power management library required the
disabling of the intel_pstate kernel driver, and the enabling of the
acpi_cpufreq kernel driver. This is no longer the case, as the use of
the intel_pstate kernel driver is now supported, and automatically
detected by the library.
Removed Items
-------------

13
doc/guides/sample_app_ug/vm_power_management.rst
View File

@ -131,10 +131,15 @@ can be accessed.
Host Operating System
~~~~~~~~~~~~~~~~~~~~~
The Host OS must also have the *apci_cpufreq* module installed, in some cases
the *intel_pstate* driver may be the default Power Management environment.
To enable *acpi_cpufreq* and disable *intel_pstate*, add the following
to the grub Linux command line:
The DPDK Power Library can use either the *acpi_cpufreq* or *intel_pstate*
kernel driver for the management of core frequencies. In many cases
the *intel_pstate* driver is the default Power Management environment.
Should the *acpi-cpufreq* driver be required, the *intel_pstate* module must
be disabled, and *apci_cpufreq* module loaded in its place.
To disable *intel_pstate* driver, add the following to the grub Linux
command line:
.. code-block:: console