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authorMark Brown <broonie@kernel.org>2020-10-06 16:19:24 +0100
committerMark Brown <broonie@kernel.org>2020-10-06 16:19:24 +0100
commitfd6b519a30a7179026d22c98d6bf10bb5ca8ca27 (patch)
treee4a6bc4d8548a5b8db7148a18eb257b84e72d48b /Documentation/admin-guide/pm/intel_pstate.rst
parent43499134f50a77844f0503df2c995f43b858f4c3 (diff)
parent856deb866d16e29bd65952e0289066f6078af773 (diff)
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Merge tag 'v5.9-rc5' into asoc-5.10
Linux 5.9-rc5
Diffstat (limited to 'Documentation/admin-guide/pm/intel_pstate.rst')
-rw-r--r--Documentation/admin-guide/pm/intel_pstate.rst8
1 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/admin-guide/pm/intel_pstate.rst b/Documentation/admin-guide/pm/intel_pstate.rst
index 7adef969ffee..5072e7064d13 100644
--- a/Documentation/admin-guide/pm/intel_pstate.rst
+++ b/Documentation/admin-guide/pm/intel_pstate.rst
@@ -123,7 +123,9 @@ Energy-Performance Bias (EPB) knob (otherwise), which means that the processor's
internal P-state selection logic is expected to focus entirely on performance.
This will override the EPP/EPB setting coming from the ``sysfs`` interface
-(see `Energy vs Performance Hints`_ below).
+(see `Energy vs Performance Hints`_ below). Moreover, any attempts to change
+the EPP/EPB to a value different from 0 ("performance") via ``sysfs`` in this
+configuration will be rejected.
Also, in this configuration the range of P-states available to the processor's
internal P-state selection logic is always restricted to the upper boundary
@@ -564,8 +566,8 @@ Energy-Performance Preference (EPP) knob (if supported) or its
Energy-Performance Bias (EPB) knob. It is also possible to write a positive
integer value between 0 to 255, if the EPP feature is present. If the EPP
feature is not present, writing integer value to this attribute is not
-supported. In this case, user can use
- "/sys/devices/system/cpu/cpu*/power/energy_perf_bias" interface.
+supported. In this case, user can use the
+"/sys/devices/system/cpu/cpu*/power/energy_perf_bias" interface.
[Note that tasks may by migrated from one CPU to another by the scheduler's
load-balancing algorithm and if different energy vs performance hints are