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`cpu`::
Sets the CPU governor to the value specified by the [option]`governor`
option and dynamically changes the Power Management Quality of
Service (PM QoS) CPU Direct Memory Access (DMA) latency according
to the CPU load.
`governor`:::
The [option]`governor` option of the 'cpu' plug-in supports specifying
CPU governors. Multiple governors are separated using '|'. The '|'
character is meant to represent a logical 'or' operator. Note that the
same syntax is used for the [option]`energy_perf_bias` option. *TuneD*
will set the first governor that is available on the system.
+
For example, with the following profile, *TuneD* will set the 'ondemand'
governor, if it is available. If it is not available, but the 'powersave'
governor is available, 'powersave' will be set. If neither of them are
available, the governor will not be changed.
+
.Specifying a CPU governor
====
----
[cpu]
governor=ondemand|powersave
----
====
`sampling_down_factor`:::
The sampling rate determines how frequently the governor checks
to tune the CPU. The [option]`sampling_down_factor` is a tunable
that multiplies the sampling rate when the CPU is at its highest
clock frequency thereby delaying load evaluation and improving
performance. Allowed values for sampling_down_factor are 1 to 100000.
+
.The recommended setting for jitter reduction
====
----
[cpu]
sampling_down_factor = 100
----
====
`energy_perf_bias`:::
[option]`energy_perf_bias` supports managing energy
vs. performance policy via x86 Model Specific Registers using the
`x86_energy_perf_policy` tool. Multiple alternative Energy Performance
Bias (EPB) values are supported. The alternative values are separated
using the '|' character. The following EPB values are supported
starting with kernel 4.13: "performance", "balance-performance",
"normal", "balance-power" and "power".
+
.Specifying alternative Energy Performance Bias values
====
----
[cpu]
energy_perf_bias=powersave|power
----
*TuneD* will try to set EPB to 'powersave'. If that fails, it will
try to set it to 'power'.
====
`latency_low, latency_high, load_threshold`:::
+
If the CPU load is lower than the value specified by
the[option]`load_threshold` option, the latency is set to the value
specified either by the [option]`latency_high` option or by the
[option]`latency_low` option.
+
`force_latency`:::
You can also force the latency to a specific value and prevent it from
dynamically changing further. To do so, set the [option]`force_latency`
option to the required latency value.
+
The maximum latency value can be specified in several ways:
+
* by a numerical value in microseconds (for example, `force_latency=10`)
* as the kernel CPU idle level ID of the maximum C-state allowed
(for example, force_latency = cstate.id:1)
* as a case sensitive name of the maximum C-state allowed
(for example, force_latency = cstate.name:C1)
* by using 'None' as a fallback value to prevent errors when alternative
C-state IDs/names do not exist. When 'None' is used in the alternatives
pipeline, all the alternatives that follow 'None' are ignored.
+
It is also possible to specify multiple fallback values separated by '|' as
the C-state names and/or IDs may not be available on some systems.
+
.Specifying fallback C-state values
====
----
[cpu]
force_latency=cstate.name:C6|cstate.id:4|10
----
This configuration tries to obtain and set the latency of C-state named C6.
If the C-state C6 does not exist, kernel CPU idle level ID 4 (state4) latency
is searched for in sysfs. Finally, if the state4 directory in sysfs is not found,
the last latency fallback value is `10` us. The value is encoded and written into
the kernel's PM QoS file `/dev/cpu_dma_latency`.
====
+
.Specifying fallback C-state values using 'None'.
====
----
[cpu]
force_latency=cstate.name:XYZ|None
----
In this case, if C-state with the name `XYZ` does not exist
[option]`force_latency`, no latency value will be written into the
kernel's PM QoS file, and no errors will be reported due to the
presence of 'None'.
====
`min_perf_pct, max_perf_pct, no_turbo`:::
These options set the internals of the Intel P-State driver exposed via the kernel's
`sysfs` interface.
+
.Adjusting the configuration of the Intel P-State driver
====
----
[cpu]
min_perf_pct=100
----
Limit the minimum P-State that will be requested by the driver. It states
it as a percentage of the max (non-turbo) performance level.
====
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