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field_name”“”)”}”(hŒ Copyright”h]”hŒ Copyright”…””}”(hj| h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1jz hjw h³hÇh´K ubhŒ
field_body”“”)”}”(hŒ |copy| 2019 Intel Corporation
”h]”hŒ paragraph”“”)”}”(hŒ |copy| 2019 Intel Corporation”h]”(hŒÂ©”…””}”(hj’ h²hh³Nh´NubhŒ 2019 Intel Corporation”…””}”(hj’ h²hh³Nh´Nubeh }”(h ]”h ]”h"]”h$]”h&]”uh1j h³hÇh´KhjŒ ubah }”(h ]”h ]”h"]”h$]”h&]”uh1jŠ hjw ubeh }”(h ]”h ]”h"]”h$]”h&]”uh1ju h³hÇh´Khjr h²hubjv )”}”(hhh]”(j{ )”}”(hŒAuthor”h]”hŒAuthor”…””}”(hj³ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1jz hj° h³hÇh´K ubj‹ )”}”(hŒ0Rafael J. Wysocki
”h]”j‘ )”}”(hŒ.Rafael J. Wysocki ”h]”(hŒRafael J. Wysocki <”…””}”(hjÅ h²hh³Nh´NubhŒ reference”“”)”}”(hŒrafael.j.wysocki@intel.com”h]”hŒrafael.j.wysocki@intel.com”…””}”(hjÏ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”Œrefuri”Œ!mailto:rafael.j.wysocki@intel.com”uh1jÍ hjÅ ubhŒ>”…””}”(hjÅ h²hh³Nh´Nubeh }”(h ]”h ]”h"]”h$]”h&]”uh1j h³hÇh´K
hjÁ ubah }”(h ]”h ]”h"]”h$]”h&]”uh1jŠ hj° ubeh }”(h ]”h ]”h"]”h$]”h&]”uh1ju h³hÇh´K
hjr h²hubeh }”(h ]”h ]”h"]”h$]”h&]”uh1jp hj] h²hh³hÇh´Kubj‘ )”}”(hXW The Performance and Energy Bias Hint (EPB) allows software to specify its
preference with respect to the power-performance tradeoffs present in the
processor. Generally, the EPB is expected to be set by user space (directly
via sysfs or with the help of the x86_energy_perf_policy tool), but there are
two reasons for the kernel to update it.”h]”hXW The Performance and Energy Bias Hint (EPB) allows software to specify its
preference with respect to the power-performance tradeoffs present in the
processor. Generally, the EPB is expected to be set by user space (directly
via sysfs or with the help of the x86_energy_perf_policy tool), but there are
two reasons for the kernel to update it.”…””}”(hjû h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j h³Œh/var/lib/git/docbuild/linux/Documentation/admin-guide/pm/intel_epb:99: ./arch/x86/kernel/cpu/intel_epb.c”h´Khj] h²hubj‘ )”}”(hX First, there are systems where the platform firmware resets the EPB during
system-wide transitions from sleep states back into the working state
effectively causing the previous EPB updates by user space to be lost.
Thus the kernel needs to save the current EPB values for all CPUs during
system-wide transitions to sleep states and restore them on the way back to
the working state. That can be achieved by saving EPB for secondary CPUs
when they are taken offline during transitions into system sleep states and
for the boot CPU in a syscore suspend operation, so that it can be restored
for the boot CPU in a syscore resume operation and for the other CPUs when
they are brought back online. However, CPUs that are already offline when
a system-wide PM transition is started are not taken offline again, but their
EPB values may still be reset by the platform firmware during the transition,
so in fact it is necessary to save the EPB of any CPU taken offline and to
restore it when the given CPU goes back online at all times.”h]”hX First, there are systems where the platform firmware resets the EPB during
system-wide transitions from sleep states back into the working state
effectively causing the previous EPB updates by user space to be lost.
Thus the kernel needs to save the current EPB values for all CPUs during
system-wide transitions to sleep states and restore them on the way back to
the working state. That can be achieved by saving EPB for secondary CPUs
when they are taken offline during transitions into system sleep states and
for the boot CPU in a syscore suspend operation, so that it can be restored
for the boot CPU in a syscore resume operation and for the other CPUs when
they are brought back online. However, CPUs that are already offline when
a system-wide PM transition is started are not taken offline again, but their
EPB values may still be reset by the platform firmware during the transition,
so in fact it is necessary to save the EPB of any CPU taken offline and to
restore it when the given CPU goes back online at all times.”…””}”(hj
h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j h³Œh/var/lib/git/docbuild/linux/Documentation/admin-guide/pm/intel_epb:99: ./arch/x86/kernel/cpu/intel_epb.c”h´K hj] h²hubj‘ )”}”(hXå Second, on many systems the initial EPB value coming from the platform
firmware is 0 ('performance') and at least on some of them that is because
the platform firmware does not initialize EPB at all with the assumption that
the OS will do that anyway. That sometimes is problematic, as it may cause
the system battery to drain too fast, for example, so it is better to adjust
it on CPU bring-up and if the initial EPB value for a given CPU is 0, the
kernel changes it to 6 ('normal').”h]”hXí Second, on many systems the initial EPB value coming from the platform
firmware is 0 (‘performance’) and at least on some of them that is because
the platform firmware does not initialize EPB at all with the assumption that
the OS will do that anyway. That sometimes is problematic, as it may cause
the system battery to drain too fast, for example, so it is better to adjust
it on CPU bring-up and if the initial EPB value for a given CPU is 0, the
kernel changes it to 6 (‘normal’).”…””}”(hj h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j h³Œh/var/lib/git/docbuild/linux/Documentation/admin-guide/pm/intel_epb:99: ./arch/x86/kernel/cpu/intel_epb.c”h´K-hj] h²hubj\ )”}”(hhh]”(ja )”}”(hŒ8Intel Performance and Energy Bias Attribute in ``sysfs``”h]”(hŒ/Intel Performance and Energy Bias Attribute in ”…””}”(hj+ h²hh³Nh´NubhŒliteral”“”)”}”(hŒ ``sysfs``”h]”hŒsysfs”…””}”(hj5 h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j3 hj+ ubeh }”(h ]”h ]”h"]”h$]”h&]”uh1j` hj( h²hh³hÇh´Kubj‘ )”}”(hX The Intel Performance and Energy Bias Hint (EPB) value for a given (logical) CPU
can be checked or updated through a ``sysfs`` attribute (file) under
:file:`/sys/devices/system/cpu/cpu/power/`, where the CPU number ````
is allocated at the system initialization time:”h]”(hŒuThe Intel Performance and Energy Bias Hint (EPB) value for a given (logical) CPU
can be checked or updated through a ”…””}”(hjI h²hh³Nh´Nubj4 )”}”(hŒ ``sysfs``”h]”hŒsysfs”…””}”(hjQ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j3 hjI ubhŒ attribute (file) under
”…””}”(hjI h²hh³Nh´Nubj4 )”}”(hŒ-:file:`/sys/devices/system/cpu/cpu/power/`”h]”hŒ%/sys/devices/system/cpu/cpu/power/”…””}”(hjc h²hh³Nh´Nubah }”(h ]”h ]”Œfile”ah"]”h$]”h&]”Œrole”Œfile”uh1j3 hjI ubhŒ, where the CPU number ”…””}”(hjI h²hh³Nh´Nubj4 )”}”(hŒ````”h]”hŒ”…””}”(hjx h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j3 hjI ubhŒ0
is allocated at the system initialization time:”…””}”(hjI h²hh³Nh´Nubeh }”(h ]”h ]”h"]”h$]”h&]”uh1j h³hÇh´Khj( h²hubhŒdefinition_list”“”)”}”(hhh]”hŒdefinition_list_item”“”)”}”(hXL ``energy_perf_bias``
Shows the current EPB value for the CPU in a sliding scale 0 - 15, where
a value of 0 corresponds to a hint preference for highest performance
and a value of 15 corresponds to the maximum energy savings.
In order to update the EPB value for the CPU, this attribute can be
written to, either with a number in the 0 - 15 sliding scale above, or
with one of the strings: "performance", "balance-performance", "normal",
"balance-power", "power" that represent values reflected by their
meaning.
This attribute is present for all online CPUs supporting the EPB
feature.
”h]”(hŒterm”“”)”}”(hŒ``energy_perf_bias``”h]”j4 )”}”(hjŸ h]”hŒenergy_perf_bias”…””}”(hj¡ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j3 hj ubah }”(h ]”h ]”h"]”h$]”h&]”uh1j› h³hÇh´K$hj— ubhŒ
definition”“”)”}”(hhh]”(j‘ )”}”(hŒËShows the current EPB value for the CPU in a sliding scale 0 - 15, where
a value of 0 corresponds to a hint preference for highest performance
and a value of 15 corresponds to the maximum energy savings.”h]”hŒËShows the current EPB value for the CPU in a sliding scale 0 - 15, where
a value of 0 corresponds to a hint preference for highest performance
and a value of 15 corresponds to the maximum energy savings.”…””}”(hj¹ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j h³hÇh´Khj¶ ubj‘ )”}”(hX In order to update the EPB value for the CPU, this attribute can be
written to, either with a number in the 0 - 15 sliding scale above, or
with one of the strings: "performance", "balance-performance", "normal",
"balance-power", "power" that represent values reflected by their
meaning.”h]”hX2 In order to update the EPB value for the CPU, this attribute can be
written to, either with a number in the 0 - 15 sliding scale above, or
with one of the strings: “performanceâ€, “balance-performanceâ€, “normalâ€,
“balance-powerâ€, “power†that represent values reflected by their
meaning.”…””}”(hjÇ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j h³hÇh´K hj¶ ubj‘ )”}”(hŒIThis attribute is present for all online CPUs supporting the EPB
feature.”h]”hŒIThis attribute is present for all online CPUs supporting the EPB
feature.”…””}”(hjÕ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j h³hÇh´K#hj¶ ubeh }”(h ]”h ]”h"]”h$]”h&]”uh1j´ hj— ubeh }”(h ]”h ]”h"]”h$]”h&]”uh1j• h³hÇh´K$hj’ ubah }”(h ]”h ]”h"]”h$]”h&]”uh1j hj( h²hh³hÇh´Nubj‘ )”}”(hX4 Note that while the EPB interface to the processor is defined at the logical CPU
level, the physical register backing it may be shared by multiple CPUs (for
example, SMT siblings or cores in one package). For this reason, updating the
EPB value for one CPU may cause the EPB values for other CPUs to change.”h]”hX4 Note that while the EPB interface to the processor is defined at the logical CPU
level, the physical register backing it may be shared by multiple CPUs (for
example, SMT siblings or cores in one package). For this reason, updating the
EPB value for one CPU may cause the EPB values for other CPUs to change.”…””}”(hjõ h²hh³Nh´Nubah }”(h ]”h ]”h"]”h$]”h&]”uh1j h³hÇh´K&hj( h²hubeh }”(h ]”Œ4intel-performance-and-energy-bias-attribute-in-sysfs”ah ]”h"]”Œ4intel performance and energy bias attribute in sysfs”ah$]”h&]”uh1j[ hj] h²hh³hÇh´Kubeh }”(h ]”Œ&intel-performance-and-energy-bias-hint”ah ]”h"]”Œ&intel performance and energy bias hint”ah$]”h&]”uh1j[ hhh²hh³hÇh´Kubeh }”(h ]”h ]”h"]”h$]”h&]”Œsource”hÇuh1hŒcurrent_source”NŒ current_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(j` NŒ generator”NŒ datestamp”NŒ source_link”NŒ
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docinfo_xform”KŒsectsubtitle_xform”‰Œ
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