Working-State Power Management

• CPU Idle Time Management
  • Concepts
  • The Idle Loop
  • Idle CPUs and The Scheduler Tick
  • The menu Governor
  • The Timer Events Oriented (TEO) Governor
  • Representation of Idle States
  • Power Management Quality of Service for CPUs
  • Idle States Control Via Kernel Command Line
• intel_idle CPU Idle Time Management Driver
  • General Information
  • Enumeration of Idle States
  • Initialization
  • Kernel Command Line Options and Module Parameters
  • Core and Package Levels of Idle States
  • References
• CPU Performance Scaling
  • The Concept of CPU Performance Scaling
  • CPU Performance Scaling in Linux
  • CPUFreq Policy Objects
  • CPU Initialization
  • Policy Interface in sysfs
  • Generic Scaling Governors
  • Frequency Boost Support
  • References
• intel_pstate CPU Performance Scaling Driver
  • General Information
  • Operation Modes
  • Turbo P-states Support
  • Processor Support
  • User Space Interface in sysfs
  • intel_pstate vs acpi-cpufreq
  • Kernel Command Line Options for intel_pstate
  • Diagnostics and Tuning
  • References
• amd-pstate CPU Performance Scaling Driver
  • Introduction
  • AMD CPPC Overview
  • Key Governors Support
  • Processor Support
  • User Space Interface in sysfs - Per-policy control
  • amd-pstate vs acpi-cpufreq
  • amd-pstate Driver Operation Modes
  • amd-pstate Preferred Core
  • amd-pstate Preferred Core Switch
  • User Space Interface in sysfs - General
  • cpupower tool support for amd-pstate
  • Diagnostics and Tuning
  • Reference
• Legacy Documentation of CPU Performance Scaling Drivers
  • AMD PowerNow! Drivers
  • cpufreq-nforce2
  • pcc-cpufreq
• Intel Performance and Energy Bias Hint
  • Intel Performance and Energy Bias Attribute in sysfs
• Intel(R) Speed Select Technology User Guide
  • intel-speed-select configuration tool
• Intel Uncore Frequency Scaling
  • Introduction
  • Sysfs Interface
  • SoCs with TPMI (Topology Aware Register and PM Capsule Interface)
  • Efficiency vs. Latency Tradeoff