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/Linux-v6.1/Documentation/admin-guide/pm/
Dintel-speed-select.rst1 .. 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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/Linux-v6.1/tools/power/x86/x86_energy_perf_policy/
Dx86_energy_perf_policy.81 .\" 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)
[all …]
/Linux-v6.1/Documentation/usb/
Dehci.rst5 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-v6.1/tools/power/cpupower/bench/
DREADME-BENCH1 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-v6.1/drivers/platform/mellanox/
DKconfig1 # 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
72 tristate "Mellanox BlueField Performance Monitoring Counters driver"
78 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-v6.1/drivers/scsi/
Dsense_codes.h1 /* 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-v6.1/Documentation/devicetree/bindings/sound/
Dcirrus,cs4234.yaml1 # 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
[all …]
/Linux-v6.1/Documentation/scsi/
DFlashPoint.rst1 .. 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-v6.1/Documentation/ABI/testing/
Dsysfs-platform_profile4 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-v6.1/Documentation/virt/
Dparavirt_ops.rst1 .. SPDX-License-Identifier: GPL-2.0
13 including native machine -- without any hypervisors.
16 corresponding to low level critical instructions and high level
17 functionalities in various areas. pv-ops allows for optimizations at run
18 time by enabling binary patching of the low-ops 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
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-v6.1/fs/squashfs/
DKconfig1 # 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
62 decompression. Each one exhibits various trade-offs between
63 decompression performance and CPU and memory usage.
70 Traditionally Squashfs has used single-threaded decompression.
78 poor performance on parallel I/O workloads when using multiple CPU
82 using this option may improve overall I/O performance.
[all …]
/Linux-v6.1/Documentation/userspace-api/
Dsysfs-platform_profile.rst5 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-v6.1/Documentation/devicetree/bindings/regulator/
Drichtek,rt5759-regulator.yaml1 # 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
[all …]
/Linux-v6.1/Documentation/admin-guide/cifs/
Dintroduction.rst26 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-v6.1/Documentation/scheduler/
Dsched-energy.rst6 ---------------
25 please refer to its documentation (see Documentation/power/energy-model.rst).
29 -----------------------------
32 - energy = [joule] (resource like a battery on powered devices)
33 - power = energy/time = [joule/second] = [watt]
38 performance [inst/s]
39 --------------------
45 -----------
48 while still getting 'good' performance. It is essentially an alternative
49 optimization objective to the current performance-only objective for the
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/Linux-v6.1/tools/perf/pmu-events/arch/x86/sandybridge/
Dsnb-metrics.json7-lines are fetched from the memory subsystem; parsed into instructions; and lastly decoded into mi…
15 …he CPU was stalled due to Frontend latency issues. For example; instruction-cache misses; iTLB mi…
31 … corrected path; following all sorts of miss-predicted branches. For example; branchy code with lo…
39 …o switches from DSB to MITE pipelines. The DSB (decoded i-cache) is a Uop Cache where the front-en…
55-cache) or MITE (legacy instruction decode) pipelines. Certain operations cannot be handled native…
60 "MetricExpr": "tma_frontend_bound - tma_fetch_latency",
68 …"MetricExpr": "(UOPS_ISSUED.ANY - UOPS_RETIRED.RETIRE_SLOTS + 4 * ((INT_MISC.RECOVERY_CYCLES_ANY /…
71 …s for which the issue-pipeline was blocked due to recovery from earlier incorrect speculation. For…
79 …etched from an incorrectly speculated program path; or stalls when the out-of-order part of the ma…
84 "MetricExpr": "tma_bad_speculation - tma_branch_mispredicts",
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/Linux-v6.1/tools/perf/pmu-events/arch/x86/jaketown/
Djkt-metrics.json7-lines are fetched from the memory subsystem; parsed into instructions; and lastly decoded into mi…
15 …he CPU was stalled due to Frontend latency issues. For example; instruction-cache misses; iTLB mi…
31 … corrected path; following all sorts of miss-predicted branches. For example; branchy code with lo…
39 …o switches from DSB to MITE pipelines. The DSB (decoded i-cache) is a Uop Cache where the front-en…
55-cache) or MITE (legacy instruction decode) pipelines. Certain operations cannot be handled native…
60 "MetricExpr": "tma_frontend_bound - tma_fetch_latency",
68 …"MetricExpr": "(UOPS_ISSUED.ANY - UOPS_RETIRED.RETIRE_SLOTS + 4 * ((INT_MISC.RECOVERY_CYCLES_ANY /…
71 …s for which the issue-pipeline was blocked due to recovery from earlier incorrect speculation. For…
79 …etched from an incorrectly speculated program path; or stalls when the out-of-order part of the ma…
84 "MetricExpr": "tma_bad_speculation - tma_branch_mispredicts",
[all …]
/Linux-v6.1/Documentation/hwmon/
Dbt1-pvt.rst1 .. 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
[all …]
Dpm6764tr.rst1 .. 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-v6.1/Documentation/trace/
Devents-kmem.rst8 - 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
[all …]
/Linux-v6.1/Documentation/timers/
Dhrtimers.rst2 hrtimers - subsystem for high-resolution kernel timers
5 This patch introduces a new subsystem for high-resolution kernel timers.
9 back and forth trying to integrate high-resolution and high-precision
11 such high-resolution timer implementations in practice, we came to the
18 - the forced handling of low-resolution and high-resolution timers in
21 32-bitness assumptions, and has been honed and micro-optimized for a
23 for many years - and thus even small extensions to it easily break
26 current usage - but it is simply not suitable to be extended for
27 high-res timers.
29 - the unpredictable [O(N)] overhead of cascading leads to delays which
[all …]
/Linux-v6.1/fs/erofs/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
9 EROFS (Enhanced Read-Only File System) is a lightweight read-only
11 xattrs/data, chunk-based deduplication, multiple devices, etc.) for
12 scenarios which need high-performance read-only solutions, e.g.
13 smartphones with Android OS, LiveCDs and high-density hosts with
16 It also provides fixed-sized output compression support in order to
18 ratios and implements in-place decompression to reuse the file page
20 quite useful to ensure guaranteed end-to-end runtime decompression
21 performance under extremely memory pressure without extra cost.
82 Enable fixed-sized output compression for EROFS.
[all …]
/Linux-v6.1/security/
DKconfig.hardening1 # 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:
[all …]
/Linux-v6.1/drivers/soc/fsl/qbman/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
26 Compiles in additional checks, to sanity-check the drivers and
27 any use of the exported API. Not recommended for performance.
30 tristate "BMan self-tests"
32 Compile the BMan self-test code. These tests will
37 bool "High-level API self-test"
41 This requires the presence of cpu-affine portals, and performs
42 high-level API testing with them (whichever portal(s) are affine
46 tristate "QMan self-tests"
48 Compile self-test code for QMan.
[all …]
/Linux-v6.1/tools/perf/pmu-events/arch/x86/ivybridge/
Divb-metrics.json7-lines are fetched from the memory subsystem; parsed into instructions; and lastly decoded into mi…
15 …he CPU was stalled due to Frontend latency issues. For example; instruction-cache misses; iTLB mi…
20 "MetricExpr": "ICACHE.IFETCH_STALL / CLKS - tma_itlb_misses",
38 … corrected path; following all sorts of miss-predicted branches. For example; branchy code with lo…
46 …o switches from DSB to MITE pipelines. The DSB (decoded i-cache) is a Uop Cache where the front-en…
62-cache) or MITE (legacy instruction decode) pipelines. Certain operations cannot be handled native…
67 "MetricExpr": "tma_frontend_bound - tma_fetch_latency",
75 "MetricExpr": "(IDQ.ALL_MITE_CYCLES_ANY_UOPS - IDQ.ALL_MITE_CYCLES_4_UOPS) / CORE_CLKS / 2",
78 …the legacy decode pipeline). This pipeline is used for code that was not pre-cached in the DSB or …
83 "MetricExpr": "(IDQ.ALL_DSB_CYCLES_ANY_UOPS - IDQ.ALL_DSB_CYCLES_4_UOPS) / CORE_CLKS / 2",
[all …]

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