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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
tools/power x86_energy_perf_policy.8: Document SoC Slider Options
x86_energy_perf_policy accesses the SoC Slider via standard
user/kernel APIs to the processor_thermal_soc_slider driver.
Machines that support SoC Slider largely use it instead of EPP,
which may continue to exist in a diminished role, or vanish entirely.
Signed-off-by: Len Brown <len.brown@intel.com>
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tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8
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tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8
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.br
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.RB "other: (\-\-force | \-\-hwp-enable | \-\-turbo-enable) value)"
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.br
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.RB "soc-slider: --soc-slider-balance # | --soc-slider-offset # | --platform-profile <name>"
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.br
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.RB "value: # | default | performance | balance-performance | balance-power | power"
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.SH DESCRIPTION
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\fBx86_energy_perf_policy\fP
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in the sliding window that HWP uses to maintain average frequency.
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This parameter is meaningful only when the "desired" field above is non-zero.
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Default is 0, allowing the HW to choose.
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.SH SOC SLIDER OPTIONS
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.PP
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Note that the Platform Profile Name must be "SoC Slider", and the
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Platform Profile must be "balanced" for the --soc-slider-balance
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and --soc-slider-offset options to take effect.
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.PP
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\fB--soc-slider-balance #\fP write numeric value to the SoC Slider.
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Values range from 0 to 6.
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Lower values result in higher performance,
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and higher values improve energy efficiency.
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Actual values are model specific.
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.PP
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\fB--soc-slider-offset #\fP write the numeric value to the Soc Slider Offset.
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The slider offset is the maximum value that software allows the SoC to
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autonomously add to the SoC Slider to improve energy efficiency.
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The value 0 prohibits the SoC from autonomously changing the slider.
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.PP
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\fB--platform-profile <name>"\fP set the platform profile to <name>.
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Available choices are in platform-profile-0/choices. The Soc Slider
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driver currently supports "low-power", "balanced", and "performance".
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.SH OTHER OPTIONS
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.PP
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\fB-f, --force\fP writes the specified values without bounds checking.
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EPB: /sys/devices/system/cpu/cpu*/power/energy_perf_bias
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EPP: /sys/devices/system/cpu/cpu*/cpufreq/energy_performance_preference
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MSR: /dev/cpu/*/msr
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Platform Profile Name: /sys/class/platform-profile/platform-profile-0/name
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Platform Profile: /sys/class/platform-profile/platform-profile-0/profile
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SOC Slider Balanced: /sys/module/processor_thermal_soc_slider/parameters/slider_balance
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SOC Slider Balanced Offset: /sys/module/processor_thermal_soc_slider/parameters/slider_offset
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.fi
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.SH "SEE ALSO"
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.nf