[PATCH] Documentation: intel_pstate: Describe hwp_dynamic_boost sysfs knob
STALE3020d
From: Rafael J. Wysocki <hidden>
Date: 2018-06-26 15:22:08
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linux-pm, lkml
From: Rafael J. Wysocki <redacted> 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: Rafael J. Wysocki <redacted> --- Documentation/admin-guide/pm/intel_pstate.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) Index: linux-pm/Documentation/admin-guide/pm/intel_pstate.rst ===================================================================
--- linux-pm.orig/Documentation/admin-guide/pm/intel_pstate.rst
+++ linux-pm/Documentation/admin-guide/pm/intel_pstate.rst@@ -378,6 +378,17 @@ argument is passed to the kernel in the but it affects the maximum possible value of per-policy P-state limits (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`` --
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