| Message ID | 306013127.TOMvMKusHN@aspire.rjw.lan (mailing list archive) |
|---|---|
| State | Mainlined |
| Delegated to: | Rafael Wysocki |
| Headers | show |
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`` >
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``