Lines Matching full:frequency
20 different clock frequency and voltage configurations, often referred to as
22 the higher the clock frequency and the higher the voltage, the more instructions
24 frequency and the higher the voltage, the more energy is consumed over a unit of
31 highest one (i.e. the highest-performance frequency/voltage configuration
38 different frequency/voltage configurations or (in the ACPI terminology) to be
45 to as CPU performance scaling or CPU frequency scaling (because it involves
46 adjusting the CPU clock frequency).
53 (CPU Frequency scaling) subsystem that consists of three layers of code: the
245 Current frequency of the CPUs belonging to this policy as obtained from
248 This is expected to be the frequency the hardware actually runs at.
249 If that frequency cannot be determined, this attribute should not
253 Maximum possible operating frequency the CPUs belonging to this policy
257 Minimum possible operating frequency the CPUs belonging to this policy
282 Current frequency of all of the CPUs belonging to this policy (in kHz).
284 In the majority of cases, this is the frequency of the last P-state
286 interface provided by it, which may or may not reflect the frequency
291 more precisely reflecting the current CPU frequency through this
292 attribute, but that still may not be the exact current CPU frequency as
311 Maximum frequency the CPUs belonging to this policy are allowed to be
319 Minimum frequency the CPUs belonging to this policy are allowed to be
330 It returns the last frequency requested by the governor (in kHz) or can
331 be written to in order to set a new frequency for the policy.
361 When attached to a policy object, this governor causes the highest frequency,
371 When attached to a policy object, this governor causes the lowest frequency,
382 to set the CPU frequency for the policy it is attached to by writing to the
393 invoke the scaling driver asynchronously when it decides that the CPU frequency
395 is capable of changing the CPU frequency from scheduler context).
399 RT or deadline scheduling classes, the governor will increase the frequency to
405 CPU frequency to apply is computed in accordance with the formula
410 ``util``, and ``f_0`` is either the maximum possible CPU frequency for the given
411 policy (if the PELT number is frequency-invariant), or the current CPU frequency
415 CPU frequency for tasks that have been waiting on I/O most recently, called
417 is passed by the scheduler to the governor callback which causes the frequency
441 This governor uses CPU load as a CPU frequency selection metric.
465 speedup threshold, in which case it will go straight for the highest frequency
488 will set the frequency to the maximum value allowed for the policy.
489 Otherwise, the selected frequency will be proportional to the estimated
498 taken into account when deciding what frequency to run the CPUs at.
507 setting the frequency to the allowed maximum) to be delayed, so the
508 frequency stays at the maximum level for a longer time.
510 Frequency fluctuations in some bursty workloads may be avoided this way
515 Reduction factor to apply to the original frequency target of the
518 for the AMD frequency sensitivity powersave bias driver
522 If the AMD frequency sensitivity powersave bias driver is not loaded,
523 the effective frequency to apply is given by
527 where f is the governor's original frequency target. The default value
530 If the AMD frequency sensitivity powersave bias driver is loaded, the
537 workload running on a CPU will change in response to frequency changes.
541 the CPU frequency, whereas workloads with the sensitivity of 100%
542 (CPU-bound) are expected to perform much better if the CPU frequency is
547 will cause the governor to select a frequency lower than its original
554 This governor uses CPU load as a CPU frequency selection metric.
557 above, but the CPU frequency selection algorithm implemented by it is different.
559 Namely, it avoids changing the frequency significantly over short time intervals
561 battery-powered). To achieve that, it changes the frequency in relatively
568 Frequency step in percent of the maximum frequency the governor is
572 This is how much the frequency is allowed to change in one go. Setting
573 it to 0 will cause the default frequency step (5 percent) to be used
575 switch the frequency between the ``scaling_min_freq`` and
580 frequency change direction.
582 If the estimated CPU load is greater than this value, the frequency will
584 ``sampling_down_factor`` mechanism is not in effect), the frequency will
585 go down. Otherwise, the frequency will not be changed.
588 Frequency decrease deferral factor, between 1 (default) and 10
591 It effectively causes the frequency to go down ``sampling_down_factor``
595 Frequency Boost Support
601 Some processors support a mechanism to raise the operating frequency of some
602 cores in a multicore package temporarily (and above the sustainable frequency
610 term "frequency boost" is used here for brevity to refer to all of those
613 The frequency boost mechanism may be either hardware-based or software-based.
616 into a special state in which it can control the CPU frequency within certain
625 scaling driver does not support the frequency boost mechanism (or supports it,
629 If the value in this file is 1, the frequency boost mechanism is enabled. This
634 permission to use the frequency boost mechanism (which still may never be used
637 If the value in this file is 0, the frequency boost mechanism is disabled and
645 The frequency boost mechanism is generally intended to help to achieve optimum
650 For this reason, many systems make it possible to disable the frequency boost
657 as a result of increasing its frequency and voltage, even temporarily.
667 3. To examine the impact of the frequency boost mechanism itself, it is useful
675 frequency boost mechanism before running benchmarks sensitive to that