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SubjectRe: [PATCH] Documentation: intel_pstate: Describe hwp_dynamic_boost sysfs knob
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On Tue, 2018-06-26 at 17:20 +0200, Rafael J. Wysocki wrote:
> 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>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.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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