Commit 649f53a3 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki

Documentation: intel_pstate: Describe hwp_dynamic_boost sysfs knob

Document the recently introduced hwp_dynamic_boost sysfs knob
allowing user space to tell intel_pstate to use iowait boosting
in the active mode with HWP enabled (to improve performance).
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
parent 9e421b8f
...@@ -378,6 +378,17 @@ argument is passed to the kernel in the command line. ...@@ -378,6 +378,17 @@ argument is passed to the kernel in the command line.
but it affects the maximum possible value of per-policy P-state limits but it affects the maximum possible value of per-policy P-state limits
(see `Interpretation of Policy Attributes`_ below for details). (see `Interpretation of Policy Attributes`_ below for details).
``hwp_dynamic_boost``
This attribute is only present if ``intel_pstate`` works in the
`active mode with the HWP feature enabled <Active Mode With HWP_>`_ in
the processor. If set (equal to 1), it causes the minimum P-state limit
to be increased dynamically for a short time whenever a task previously
waiting on I/O is selected to run on a given logical CPU (the purpose
of this mechanism is to improve performance).
This setting has no effect on logical CPUs whose minimum P-state limit
is directly set to the highest non-turbo P-state or above it.
.. _status_attr: .. _status_attr:
``status`` ``status``
......
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