1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Kernel Developers Begin Work On CPPC Processor Performance Controls

Linux Kernel

Published on 15 August 2014 03:52 AM EDT
Written by Michael Larabel in Linux Kernel
Comment On This Article

Ashwin Chaugule of Linaro has announced his experimental kernel implementation of Collaborative Processor Performance Controls (CPPC) that is part of the ACPI 5.1 specification.

An increasing amount of x86 and ARM64 hardware is expected in the marketplace soon that supports CPPC, which is a new interface for CPU performance control between the OS and platform, while right now it's just exposed by a limited number of systems. Here's more from Ashwin's description:
CPPC is the new interface for CPU performance control between the OS and the platform defined in ACPI 5.0+. The interface is built on an abstract representation of CPU performance rather than raw frequency. Basic operation consists of:

* Platform enumerates supported performance range to OS

* OS requests desired performance level over some time window along with min and max instantaneous limits

* Platform is free to optimize power/performance within bounds provided by OS

* Platform provides telemetry back to OS on delivered performance

The Collaborative Processor Performance Control work published is largely just a starting point and to initiate discussion about implementing this CPU performance-controlling feature. Those interested in learning much more can read this lengthy email post.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
  2. RadeonSI Gallium3D vs. Catalyst At 4K UHD On Linux
  3. MSAA RadeonSI Gallium3D Performance Preview
  4. Intel Core i7 5960X CPU Core Scaling Under Linux
Latest Linux News
  1. SNA & UXA Intel Benchmarks With X.Org Server 1.16
  2. Graphics Driver Changes Coming In The Linux 3.18 Kernel
  3. Tropico 5 Being Released For Linux Gamers This Week
  4. Eclipse IDE Starts Firing Up On Wayland's Weston
  5. OpenSUSE Announcement On SUSE's Recent Merger
  6. Valve Begins Publicly Tracking AMD Catalyst Linux Issues
  7. Digia Qt Spinoff Is Called "The Qt Company"
  8. GNOME 3.14 Makes More Progress In Running Natively On Wayland
  9. Minix 3.3 Released With Cortex-A8 ARM Support, NetBSD Userland Compatibility
  10. More Intel DRM Changes Queued For Linux 3.18, Including Old i830M Fixes
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Stop grabbing my keyboard :(
  3. New Group Calls For Boycotting Systemd
  4. Best Radeon for a Power Mac G5?
  5. New stress testing utility for GPU's
  6. Hd 6850
  7. support for first generation UVD blocks (RV6xx, RS780, RS880 and RV790)
  8. Nvidia joins the ranks of Apple and Microsoft