| Message ID | 20240624213400.67773-5-mario.limonciello@amd.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Mario Limonciello |
| Headers | show |
| Series | AMD Pstate Driver Core Performance Boost | expand |
Mario Limonciello <mario.limonciello@amd.com> writes: > From: Perry Yuan <perry.yuan@amd.com> > > 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. > > Signed-off-by: Perry Yuan <perry.yuan@amd.com> > Co-developed-by: Mario Limonciello <mario.limonciello@amd.com> > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> LGTM Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > --- > Documentation/admin-guide/pm/amd-pstate.rst | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst > index f5ee81419a93..d0324d44f548 100644 > --- a/Documentation/admin-guide/pm/amd-pstate.rst > +++ b/Documentation/admin-guide/pm/amd-pstate.rst > @@ -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`. > > -- > 2.43.0
diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index f5ee81419a93..d0324d44f548 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -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`.