Searched full:performance (Results 1 – 25 of 590) sorted by relevance
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| /Documentation/devicetree/bindings/dvfs/ |
| D | performance-domain.yaml | 4 $id: http://devicetree.org/schemas/dvfs/performance-domain.yaml#
7 title: Generic performance domains
13 This binding is intended for performance management of groups of devices or
14 CPUs that run in the same performance domain. Performance domains must not
15 be confused with power domains. A performance domain is defined by a set
16 of devices that always have to run at the same performance level. For a given
17 performance domain, there is a single point of control that affects all the
18 devices in the domain, making it impossible to set the performance level of
21 have a common frequency control, is said to be in the same performance
24 This device tree binding can be used to bind performance domain consumer
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| /Documentation/admin-guide/acpi/ |
| D | cppc_sysfs.rst | 4 Collaborative Processor Performance Control (CPPC)
13 performance of a logical processor on a contiguous and abstract performance
14 scale. CPPC exposes a set of registers to describe abstract performance scale,
15 to request performance levels and to measure per-cpu delivered performance.
40 * highest_perf : Highest performance of this processor (abstract scale).
41 * nominal_perf : Highest sustained performance of this processor
43 * lowest_nonlinear_perf : Lowest performance of this processor with nonlinear
45 * lowest_perf : Lowest performance of this processor (abstract scale).
49 The above frequencies should only be used to report processor performance in
53 * feedback_ctrs : Includes both Reference and delivered performance counter.
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| D | fan_performance_states.rst | 4 ACPI Fan Performance States
10 These attributes list properties of fan performance states.
37 where each of the "state*" files represents one performance state of the fan
47 to this performance state (0-9).
71 Here use can look at fan performance states for a reference speed (speed_rpm)
74 not defined in the performance states.
80 This sysfs attribute is presented in the same directory as performance states.
82 ACPI Fan Performance Feedback
90 in the same directory as performance states.
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| /Documentation/devicetree/bindings/cpufreq/ |
| D | qemu,virtual-cpufreq.yaml | 14 Virtual CPUFreq is a virtualized driver in guest kernels that sends performance
16 is associated with a performance domain which can be shared with other vCPUs.
17 Each performance domain has its own set of registers for performance controls.
26 Address and size of region containing performance controls for each of the
27 performance domains. Regions for each performance domain is placed
30 total number of performance domains.
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| D | cpufreq-mediatek-hw.yaml | 29 "#performance-domain-cells":
31 Number of cells in a performance domain specifier.
33 performance domains.
39 - "#performance-domain-cells"
53 performance-domains = <&performance 0>;
64 performance: performance-controller@11bc00 {
68 #performance-domain-cells = <1>;
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| D | apple,cluster-cpufreq.yaml | 15 operating-points-v2 table to define the CPU performance states, with the
34 '#performance-domain-cells':
40 - '#performance-domain-cells'
58 performance-domains = <&cpufreq_e>;
66 performance-domains = <&cpufreq_p>;
106 cpufreq_e: performance-controller@210e20000 {
109 #performance-domain-cells = <0>;
112 cpufreq_p: performance-controller@211e20000 {
115 #performance-domain-cells = <0>;
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| /Documentation/admin-guide/pm/ |
| D | intel-speed-select.rst | 8 collection of features that give more granular control over CPU performance.
9 With Intel(R) SST, one server can be configured for power and performance for a
15 …tel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enhancing-performance.pdf
25 how these commands change the power and performance profile of the system under
79 Intel(R) Speed Select Technology - Performance Profile (Intel(R) SST-PP)
83 performance requirements. This helps users during deployment as they do not have
85 Technology - Performance Profile (Intel(R) SST-PP) feature introduces a mechanism
86 that allows multiple optimized performance profiles per system. Each profile
89 performance profile and meet CPU online/offline requirement, the user can expect
93 Number or performance levels
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| D | intel_epb.rst | 5 Intel Performance and Energy Bias Hint
16 Intel Performance and Energy Bias Attribute in ``sysfs``
19 The Intel Performance and Energy Bias Hint (EPB) value for a given (logical) CPU
26 a value of 0 corresponds to a hint preference for highest performance
31 with one of the strings: "performance", "balance-performance", "normal",
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| D | amd-pstate.rst | 5 ``amd-pstate`` CPU Performance Scaling Driver
16 ``amd-pstate`` is the AMD CPU performance scaling driver that introduces a
19 Performance Control (CPPC) which provides finer grain frequency management
24 communicate the performance hints to hardware.
27 ``ondemand``, etc. to manage the performance hints which are provided by
39 Collaborative Processor Performance Control (CPPC) interface enumerates a
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
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| D | intel_pstate.rst | 5 ``intel_pstate`` CPU Performance Scaling Driver
17 :doc:`CPU performance scaling subsystem <cpufreq>` in the Linux kernel
25 than just an operating frequency or an operating performance point (see the
30 uses frequencies for identifying operating performance points of CPUs and
58 active mode, it uses its own internal performance scaling governor algorithm or
59 allows the hardware to do performance scaling by itself, while in the passive
61 a certain performance scaling algorithm. Which of them will be in effect
88 active mode: ``powersave`` and ``performance``. The way they both operate
94 Namely, if that option is set, the ``performance`` algorithm will be used by
117 HWP + ``performance``
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| D | intel_uncore_frequency_scaling.rst | 17 performance, SoCs have internal algorithms for scaling uncore frequency. These
20 It is possible that users have different expectations of uncore performance and
22 the scaling min/max frequencies via cpufreq sysfs to improve CPU performance.
25 different core and uncore performance at distinct phases and they may want to
27 improve overall performance.
120 The Efficiency Latency Control (ELC) feature improves performance
124 get desired performance.
128 While this may result in the best performance per watt, workload may be
129 expecting higher performance at the expense of power. Consider an
133 target performance.
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| /Documentation/admin-guide/perf/ |
| D | hns3-pmu.rst | 2 HNS3 Performance Monitoring Unit (PMU)
5 HNS3(HiSilicon network system 3) Performance Monitoring Unit (PMU) is an
6 End Point device to collect performance statistics of HiSilicon SoC NIC.
9 HNS3 PMU supports collection of performance statistics such as bandwidth,
48 Each performance statistic has a pair of events to get two values to
49 calculate real performance data in userspace.
57 computation to calculate real performance data is:::
82 PMU collect performance statistics for all HNS3 PCIe functions of IO DIE.
89 PMU collect performance statistic of one whole physical port. The port id
98 PMU collect performance statistic of one tc of physical port. The port id
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| /Documentation/admin-guide/ |
| D | perf-security.rst | 9 Usage of Performance Counters for Linux (perf_events) [1]_ , [2]_ , [3]_
14 depends on the nature of data that perf_events performance monitoring
15 units (PMU) [2]_ and Perf collect and expose for performance analysis.
16 Collected system and performance data may be split into several
21 its topology, used kernel and Perf versions, performance monitoring
30 faults, CPU migrations), architectural hardware performance counters
46 So, perf_events performance monitoring and observability operations are
56 all kernel security permission checks so perf_events performance
70 as privileged processes with respect to perf_events performance
73 privilege [13]_ (POSIX 1003.1e: 2.2.2.39) for performance monitoring and
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| /Documentation/ABI/testing/ |
| D | sysfs-platform_profile | 13 and performance
14 balanced-performance Balance between performance and low
16 towards performance
17 performance High performance operation
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| D | sysfs-bus-event_source-devices-hv_gpci | 100 runtime by setting "Enable Performance Information Collection" option.
107 * "-EPERM" : Partition is not permitted to retrieve performance information,
108 required to set "Enable Performance Information Collection" option.
132 runtime by setting "Enable Performance Information Collection" option.
139 * "-EPERM" : Partition is not permitted to retrieve performance information,
140 required to set "Enable Performance Information Collection" option.
164 runtime by setting "Enable Performance Information Collection" option.
171 * "-EPERM" : Partition is not permitted to retrieve performance information,
172 required to set "Enable Performance Information Collection" option.
196 runtime by setting "Enable Performance Information Collection" option.
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| D | sysfs-class-fc_host | 7 performance impact notification (FPIN) event.
15 performance impact notification (FPIN) event.
23 performance impact notification (FPIN) event.
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| D | sysfs-class-fc_remote_ports | 7 performance impact notification (FPIN) event.
15 performance impact notification (FPIN) event.
23 performance impact notification (FPIN) event.
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| /Documentation/userspace-api/ |
| D | sysfs-platform_profile.rst | 5 On modern systems the platform performance, temperature, fan and other
13 operation or towards performance.
19 NOT a goal of this API to allow monitoring the resulting performance
20 characteristics. Monitoring performance is best done with device/vendor
23 Specifically when selecting a high performance profile the actual achieved
24 performance may be limited by various factors such as: the heat generated
28 performance level.
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| /Documentation/scheduler/ |
| D | sched-util-clamp.rst | 11 feature that allows user space to help in managing the performance requirement
16 performance requirements and restrictions of the tasks, thus it helps the
23 system run at a certain performance point.
26 performance constraints. It consists of two tunables:
31 These two bounds will ensure a task will operate within this performance range
36 performance point to operate at to deliver the desired user experience. Or one
38 much resources and should not go above a specific performance point. Viewing
39 the uclamp values as performance points rather than utilization is a better
44 performance point required by its display pipeline to ensure no frame is
58 resources background tasks are consuming by capping the performance point they
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| /Documentation/power/ |
| D | energy-model.rst | 11 the power consumed by devices at various performance levels, and the kernel
68 'performance domain' in the system. A performance domain is a group of CPUs
69 whose performance is scaled together. Performance domains generally have a
70 1-to-1 mapping with CPUFreq policies. All CPUs in a performance domain are
71 required to have the same micro-architecture. CPUs in different performance
94 It is possible also to modify the CPU performance values for each EM's
95 performance state. Thus, the full power and performance profile (which
109 2.2 Registration of performance domains
118 the real power measurements performed for each performance state. Thus, this
122 Drivers are expected to register performance domains into the EM framework by
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| /Documentation/devicetree/bindings/bus/ |
| D | aspeed,ast2600-ahbc.yaml | 7 title: ASPEED Advanced High-Performance Bus Controller (AHBC)
14 Advanced High-performance Bus Controller (AHBC) supports plenty of mechanisms
16 to control the overall operations of Advanced High-performance Bus (AHB).
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| /Documentation/arch/x86/ |
| D | intel-hfi.rst | 14 The HFI gives the operating system a performance and energy efficiency
22 about the performance and energy efficiency of each CPU in the system. Each
24 indicate higher capability. Energy efficiency and performance are reported in
35 excessive heat, the HFI may reflect reduced performance on specific CPUs.
38 task placement decisions. For instance, if either the performance or energy
41 that processor for performance or energy efficiency reasons, respectively.
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| /Documentation/admin-guide/mm/ |
| D | numaperf.rst | 2 NUMA Memory Performance
10 as CPU cache coherence, but may have different performance. For example,
14 under different domains, or "nodes", based on locality and performance
36 performance when accessing a given memory target. Each initiator-target
56 nodes' access characteristics share the same performance relative to other
65 NUMA Performance
69 be allocated from based on the node's performance characteristics. If
79 The performance characteristics the kernel provides for the local initiators
103 performance characteristics in order to provide large address space of
129 attributes in order to maximize the performance out of such a setup.
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| /Documentation/networking/device_drivers/ethernet/neterion/ |
| D | s2io.rst | 14 - 5. Performance suggestions
63 significant performance improvement on certain platforms(SGI Altix,
67 resulting in noticeable performance improvement (up to 7% on certain
114 5. Performance suggestions
123 good performance::
133 Transmit performance:
164 Receive performance:
173 b. Use 2-buffer mode. This results in large performance boost on
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| /Documentation/devicetree/bindings/csky/ |
| D | pmu.txt | 2 C-SKY Performance Monitor Units
5 C-SKY Performance Monitor is designed for ck807/ck810/ck860 SMP soc and
6 it could count cpu's events for helping analysis performance issues.
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