Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH] Documentation: intel_pstate: Describe hwp_dynamic_boost sysfs knob | Date | Tue, 26 Jun 2018 17:20:43 +0200 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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 <rafael.j.wysocki@intel.com> --- 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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