| /linux/Documentation/admin-guide/pm/ |
| H A D | intel-speed-select.rst | 1 .. SPDX-License-Identifier: GPL-2.0
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
14 - https://www.intel.com/content/www/us/en/architecture-and-technology/speed-select-technology-artic…
15 - https://builders.intel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enha…
19 dynamically without pre-configuring via BIOS setup options. This dynamic
25 how these commands change the power and performance profile of the system under
29 intel-speed-select configuration tool
32 Most Linux distribution packages may include the "intel-speed-select" tool. If not,
38 # cd tools/power/x86/intel-speed-select/
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| H A D | intel_uncore_frequency_scaling.rst | 1 .. SPDX-License-Identifier: GPL-2.0
8 :Copyright: |copy| 2022-2023 Intel Corporation
13 ------------
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.
30 ---------------
45 This is a read-only attribute. If users adjust max_freq_khz,
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| /linux/tools/power/x86/x86_energy_perf_policy/ |
| H A D | x86_energy_perf_policy.8 | 1 .\" This page Copyright (C) 2010 - 2015 Len Brown <len.brown@intel.com>
5 x86_energy_perf_policy \- Manage Energy vs. Performance Policy via x86 Model Specific Registers
10 .RB "scope: \-\-cpu\ cpu-list | \-\-pkg\ pkg-list"
12 .RB "cpu-list, pkg-list: # | #,# | #-# | all"
14 .RB "field: \-\-all | \-\-epb | \-\-hwp-epp | \-\-hwp-min | \-\-hwp-max | \-\-hwp-desired"
16 .RB "other: (\-\-force | \-\-hwp-enable | \-\-turbo-enable) value)"
18 .RB "value: # | default | performance | balance-performance | balance-power | power"
21 displays and updates energy-performance policy settings specific to
23 updates, no matter if the Linux cpufreq sub-system is enabled or not.
27 such as how aggressively the hardware enters and exits CPU idle states (C-states)
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| /linux/Documentation/usb/ |
| H A D | ehci.rst | 5 27-Dec-2002
7 The EHCI driver is used to talk to high speed USB 2.0 devices using
8 USB 2.0-capable host controller hardware. The USB 2.0 standard is
11 - "High Speed" 480 Mbit/sec (60 MByte/sec)
12 - "Full Speed" 12 Mbit/sec (1.5 MByte/sec)
13 - "Low Speed" 1.5 Mbit/sec
15 USB 1.1 only addressed full speed and low speed. High speed devices
24 high speed "split transactions" that don't waste transfer bandwidth.
31 While usb-storage devices have been available since mid-2001 (working
33 been available since late 2001, and other kinds of high speed devices
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| /linux/Documentation/devicetree/bindings/bus/ |
| H A D | aspeed,ast2600-ahbc.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/bus/aspeed,ast2600-ahbc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: ASPEED Advanced High-Performance Bus Controller (AHBC)
10 - Neal Liu <neal_liu@aspeedtech.com>
11 - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
14 Advanced High-performance Bus Controller (AHBC) supports plenty of mechanisms
16 to control the overall operations of Advanced High-performance Bus (AHB).
21 - aspeed,ast2600-ahbc
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| /linux/tools/power/cpupower/bench/ |
| H A D | README-BENCH | 1 This is cpufreq-bench, a microbenchmark for the cpufreq framework.
7 - Identify worst case performance loss when doing dynamic frequency
9 - Identify average reaction time of a governor to CPU load changes
10 - (Stress) Testing whether a cpufreq low level driver or governor works
12 - Identify cpufreq related performance regressions between kernels
13 - Possibly Real time priority testing? -> what happens if there are
15 - ...
18 - Power saving related regressions (In fact as better the performance
21 - Real world (workloads)
27 cpufreq-bench helps to test the condition of a given cpufreq governor.
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| /linux/drivers/scsi/ |
| H A D | sense_codes.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
4 * http://www.t10.org/lists/asc-num.txt [most recent: 20200817]
9 SENSE_CODE(0x0002, "End-of-partition/medium detected")
11 SENSE_CODE(0x0004, "Beginning-of-partition/medium detected")
12 SENSE_CODE(0x0005, "End-of-data detected")
51 SENSE_CODE(0x0409, "Logical unit not ready, self-test in progress")
87 SENSE_CODE(0x0801, "Logical unit communication time-out")
89 SENSE_CODE(0x0803, "Logical unit communication CRC error (Ultra-DMA/32)")
102 SENSE_CODE(0x0B01, "Warning - specified temperature exceeded")
103 SENSE_CODE(0x0B02, "Warning - enclosure degraded")
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| /linux/drivers/platform/mellanox/ |
| H A D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0
23 This driver handles hot-plug events for the power suppliers, power
43 This driver provides support for the Mellanox MSN4800-XX line cards,
45 providing a high performance switching solution for Enterprise Data
46 Centers (EDC) for building Ethernet based clusters, High-Performance
73 tristate "Mellanox BlueField Performance Monitoring Counters driver"
79 to performance monitoring counters within various blocks in the
92 serial port (RS-232 interface), an OOB port (1G/100M MDI interface)
96 System equipped with Nvidia®Spectrum-1 32x100GbE Ethernet switch.
|
| /linux/Documentation/devicetree/bindings/sound/ |
| H A D | cirrus,cs4234.yaml | 1 # SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - patches@opensource.cirrus.com
14 high performance analog to digital conversion, 4 channels of high
15 performance digital to analog conversion for audio, and 1 channel of
19 standard audio grade DAC, with performance specifications identical
22 provide lead time for the external switch-mode power supply, and a
24 low-latency path to the outputs.
29 - cirrus,cs4234
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| /linux/Documentation/scsi/ |
| H A D | FlashPoint.rst | 1 .. SPDX-License-Identifier: GPL-2.0
17 FREMONT, CA, -- October 8, 1996 -- Mylex Corporation has expanded Linux
33 Linux is a freely-distributed implementation of UNIX for Intel x86, Sun
53 produces high performance disk array (RAID) controllers, and complementary
58 enhance CPU utilization, optimize I/O performance, and ensure data security
71 510/796-6100
78 BusLogic FlashPoint LT/BT-948 Upgrade Program
82 BusLogic FlashPoint LW/BT-958 Upgrade Program
89 particularly well suited for a high performance multitasking operating
91 vendors as the latest thing, and has been sold even on many of their high
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| /linux/Documentation/ABI/testing/ |
| H A D | sysfs-platform_profile | 4 Description: This file contains a space-separated list of profiles supported for this device.
6 Drivers must use the following standard profile-names:
9 low-power Low power consumption
13 and performance
14 balanced-performance Balance between performance and low
16 towards performance
17 performance High performance operation
34 either directly by the embedded-controller or fully handled
|
| /linux/Documentation/virt/ |
| H A D | paravirt_ops.rst | 1 .. SPDX-License-Identifier: GPL-2.0
13 including native machine -- without any hypervisors.
16 corresponding to low-level critical instructions and high-level
18 time by enabling binary patching of the low-level critical operations
23 - simple indirect call
24 These operations correspond to high-level functionality where it is
27 - indirect call which allows optimization with binary patch
28 Usually these operations correspond to low-level critical instructions. They
29 are called frequently and are performance critical. The overhead is
32 - a set of macros for hand written assembly code
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| /linux/fs/squashfs/ |
| H A D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "SquashFS 4.0 - Squashed file system support"
7 Read-Only File System). Squashfs is a highly compressed read-only
16 Squashfs is intended for general read-only filesystem use, for
51 Doing so can significantly improve performance because
88 decompression. Each one exhibits various trade-offs between
89 decompression performance and CPU and memory usage.
97 Traditionally Squashfs has used single-threaded decompression.
106 poor performance on parallel I/O workloads when using multiple CPU
110 using this option may improve overall I/O performance.
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| /linux/Documentation/userspace-api/ |
| H A 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
27 about any sub-optimal conditions which are impeding reaching the requested
28 performance level.
33 gets a consistent experience the sysfs-platform_profile ABI document defines
42 expected behaviour, to the sysfs-platform_profile ABI documentation.
|
| /linux/arch/s390/kernel/ |
| H A D | hiperdispatch.c | 1 // SPDX-License-Identifier: GPL-2.0
11 * Dynamically calculates the optimum number of high capacity COREs
14 * During topology updates the CPU capacities are always re-adjusted.
18 * -> hiperdispatch's reoccuring work function reads CPU capacities to
19 * determine high capacity CPU count.
20 * -> during a topology update hiperdispatch's adjustment function
30 * crosses the threshold value hiperdispatch falls back to giving high
33 * of them high capacity.
36 * performance. Comparing the throughput of;
37 * - single CORE, with N threads, running N tasks
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| /linux/Documentation/devicetree/bindings/regulator/ |
| H A D | richtek,rt5759-regulator.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/regulator/richtek,rt5759-regulator.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Richtek RT5759 High Performance DCDC Converter
10 - ChiYuan Huang <cy_huang@richtek.com>
13 The RT5759 is a high-performance, synchronous step-down DC-DC converter that
15 voltage can be programmable with I2C controlled 7-Bit VID.
18 https://www.richtek.com/assets/product_file/RT5759/DS5759-00.pdf
23 - richtek,rt5759
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| H A D | renesas,raa215300.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Biju Das <biju.das.jz@bp.renesas.com>
13 The RAA215300 is a high-performance, low-cost 9-channel PMIC designed for
14 32-bit and 64-bit MCU and MPU applications. It supports DDR3, DDR3L, DDR4,
16 built-in Real-Time Clock (RTC), 32kHz crystal oscillator, and coin cell
18 ideal for System-On-Module (SOM) applications. A spread spectrum feature
19 provides an ease-of-use solution for noise-sensitive audio or RF applications.
25 …-power-management/multi-channel-power-management-ics-pmics/ssdsoc-power-management-ics-pmic-and-pm…
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| H A D | microchip,mcp16502.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: MCP16502 - High-Performance PMIC
10 - Andrei Simion <andrei.simion@microchip.com>
16 of High-Performance mode (HPM).
22 lpm-gpios:
25 Note that this GPIO must remain high during
26 suspend-to-ram, keeping the PMIC into HIBERNATE mode.
31 lvin-supply:
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| /linux/Documentation/admin-guide/cifs/ |
| H A D | introduction.rst | 26 security features, excellent parallelized high performance i/o, better
27 POSIX compliance, secure per-user session establishment, encryption,
28 high performance safe distributed caching (leases/oplocks), optional packet
39 https://git.samba.org/?p=cifs-utils.git
43 git://git.samba.org/cifs-utils.git
|
| /linux/Documentation/admin-guide/sysctl/ |
| H A D | vm.rst | 13 ------------------------------------------------------------------------------
27 - admin_reserve_kbytes
28 - compact_memory
29 - compaction_proactiveness
30 - compact_unevictable_allowed
31 - dirty_background_bytes
32 - dirty_background_ratio
33 - dirty_bytes
34 - dirty_expire_centisecs
35 - dirty_ratio
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| /linux/Documentation/hwmon/ |
| H A D | bt1-pvt.rst | 1 .. SPDX-License-Identifier: GPL-2.0-only
3 Kernel driver bt1-pvt
8 * Baikal-T1 PVT sensor (in SoC)
10 Prefix: 'bt1-pvt'
12 Addresses scanned: -
21 -----------
24 embedded into Baikal-T1 process, voltage and temperature sensors. PVT IP-core
27 transistors performance. The driver can optionally provide the hwmon alarms
29 compile-time configurable due to the hardware interface implementation
37 the system performance. So in case if alarms are unnecessary in your system
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| H A D | pm6764tr.rst | 1 .. SPDX-License-Identifier: GPL-2.0-only
12 Addresses scanned: -
20 ------------
22 This driver supports the STMicroelectronics PM6764TR chip. The PM6764TR is a high
23 performance digital controller designed to power Intel's VR12.5 processors and memories.
26 functions to provide maximum flexibility and performance. The NVM is embedded to store
27 custom configurations. The PM6764TR device features up to 4-phase programmable operation.
|
| /linux/Documentation/trace/ |
| H A D | events-kmem.rst | 8 - Slab allocation of small objects of unknown type (kmalloc)
9 - Slab allocation of small objects of known type
10 - Page allocation
11 - Per-CPU Allocator Activity
12 - External Fragmentation
40 These events are similar in usage to the kmalloc-related events except that
56 the per-CPU allocator (high performance) or the buddy allocator.
59 mm_page_alloc_zone_locked event is triggered. This event is important as high
60 amounts of activity imply high activity on the zone->lock. Taking this lock
61 impairs performance by disabling interrupts, dirtying cache lines between
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| /linux/security/ |
| H A D | Kconfig.hardening | 1 # SPDX-License-Identifier: GPL-2.0-only
12 flaws, this plugin is available to identify and zero-initialize
23 def_bool $(cc-option,-ftrivial-auto-var-init=pattern)
26 def_bool $(cc-option,-ftrivial-auto-var-init=zero)
29 # Clang 16 and later warn about using the -enable flag, but it
31 …def_bool $(cc-option,-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-wi…
47 variables initialized), but the performance impact depends
64 bool "zero-init structs marked for userspace (weak)"
69 Zero-initialize any structures on the stack containing
72 exposures, like CVE-2013-2141:
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| /linux/fs/bcachefs/ |
| H A D | Kconfig | 29 The bcachefs filesystem - a modern, copy on write filesystem, with
43 organizes data into reed-solomon stripes instead of ordinary
64 bool "bcachefs unit and performance tests"
67 Include some unit and performance tests for the core btree code
79 This disables device latency tracking and time stats, only for performance testing
96 normally want these enabled because they happen at very high rates.
|