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Documentation: cpufreq: amd-pstate: update doc for Per CPU boost control method

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Updates the documentation in `amd-pstate.rst` to include information about
the per CPU boost control feature. Users can now enable or disable the
Core Performance Boost (CPB) feature on individual CPUs using the `boost`
sysfs attribute.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Co-developed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20240626042733.3747-5-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
This commit is contained in:
Perry Yuan
2024-06-25 23:27:33 -05:00
committed by Mario Limonciello
parent 89ac482d51
commit 6d588891a9
1 changed files with 16 additions and 0 deletions
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Documentation/admin-guide/pm/amd-pstate.rst
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@@ -281,6 +281,22 @@ integer values defined between 0 to 255 when EPP feature is enabled by platform
firmware, if EPP feature is disabled, driver will ignore the written value
This attribute is read-write.
``boost``
The `boost` sysfs attribute provides control over the CPU core
performance boost, allowing users to manage the maximum frequency limitation
of the CPU. This attribute can be used to enable or disable the boost feature
on individual CPUs.
When the boost feature is enabled, the CPU can dynamically increase its frequency
beyond the base frequency, providing enhanced performance for demanding workloads.
On the other hand, disabling the boost feature restricts the CPU to operate at the
base frequency, which may be desirable in certain scenarios to prioritize power
efficiency or manage temperature.
To manipulate the `boost` attribute, users can write a value of `0` to disable the
boost or `1` to enable it, for the respective CPU using the sysfs path
`/sys/devices/system/cpu/cpuX/cpufreq/boost`, where `X` represents the CPU number.
Other performance and frequency values can be read back from
``/sys/devices/system/cpu/cpuX/acpi_cppc/``, see :ref:`cppc_sysfs`.