Lines Matching refs:performance
16 ``amd-pstate`` is the AMD CPU performance scaling driver that introduces a
24 communicate the performance hints to hardware.
27 ``ondemand``, etc. to manage the performance hints which are provided by
40 continuous, abstract, and unit-less performance value in a scale that is
41 not tied to a specific performance state / frequency. This is an ACPI
42 standard [2]_ which software can specify application performance goals and
45 interpreter for performance adjustments. ``amd-pstate`` will initialize a
47 to manage each performance update behavior. ::
94 This is the absolute maximum performance an individual processor may reach,
95 assuming ideal conditions. This performance level may not be sustainable
104 This is the maximum sustained performance level of the processor, assuming
106 thermal, etc.), this is the performance level the processor is expected to
108 able to sustain their nominal performance state simultaneously.
113 This is the lowest performance level at which nonlinear power savings are
115 scaling. Above this threshold, lower performance levels should be generally
116 more energy efficient than higher performance levels. This register
117 effectively conveys the most efficient performance level to ``amd-pstate``.
122 This is the absolute lowest performance level of the processor. Selecting a
123 performance level lower than the lowest nonlinear performance level may
130 ``amd-pstate`` passes performance goals through these registers. The
131 register drives the behavior of the desired performance target.
133 Minimum requested performance (RW)
136 ``amd-pstate`` specifies the minimum allowed performance level.
138 Maximum requested performance (RW)
141 ``amd-pstate`` specifies a limit the maximum performance that is expected
144 Desired performance target (RW)
147 ``amd-pstate`` specifies a desired target in the CPPC performance scale as
149 performance (infrastructure max). Below the nominal sustained performance
150 level, desired performance expresses the average performance level of the
151 processor subject to hardware. Above the nominal performance level,
152 the processor must provide at least nominal performance requested and go higher
159 toward performance (0x0) or energy efficiency (0xff).
176 registers the adjust_perf callback to implement performance update behavior
180 will call ``cpufreq_update_util`` and assigns the target performance according
182 Then, ``amd-pstate`` updates the desired performance according to the CPU
248 Maximum CPPC performance and CPU frequency that the driver is allowed to
249 set, in percent of the maximum supported CPPC performance level (the highest
250 performance supported in `AMD CPPC Performance Capability <perf_cap_>`_).
251 In some ASICs, the highest CPPC performance is not the one in the ``_CPC``
260 in percent of the maximum supported CPPC performance level. (Please see the
261 lowest non-linear performance in `AMD CPPC Performance Capability
276 The current energy performance preference can be read from this attribute.
277 and user can change current preference according to energy or performance needs
284 Other performance and frequency values can be read back from
292 provided by the platform firmware are used for CPU performance scaling, but
299 platforms. The AMD P-States mechanism is the more performance and energy
311 performance, Maximum requested performance, and Energy Performance Preference
322 wants to bias toward performance (0x0) or energy efficiency (0xff) to the CPPC firmware.
334 performance scale as a relative number. This can be expressed as percentage of nominal
335 performance (infrastructure max). Below the nominal sustained performance level,
336 desired performance expresses the average performance level of the processor subject
337 to the Performance Reduction Tolerance register. Above the nominal performance level,
338 processor must provide at least nominal performance requested and go higher if current
385 available cpufreq governors: ondemand conservative powersave userspace performance schedutil
444 generate performance plots. This utility can be used to debug and tune the
445 performance of ``amd-pstate`` driver. The tracer tool needs to import intel
474 … can introduce more functional or performance tests to align the result together, it will benefit …
496 …| 3 | amd_pstate_ut_check_perf || Check if the each performance values are reasonable.…
509 These changes include desire performance, frequency, load, performance, energy etc.
516 These changes include desire performance, frequency, load, time, energy etc.
588 The png images shows the performance, energy and performan per watt of each test.
641 The png images shows the performance, energy and performan per watt of each test.