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

Intel's P-State Driver Is Getting Better Tuned For Performance

Intel

Published on 27 April 2014 06:24 PM EDT
Written by Michael Larabel in Intel
11 Comments

The Intel P-State driver that's found in modern versions of the Linux kernel as a replacement to the older CPUfreq code is getting tuned for better performance while boasting greater power-savings.

Stratos Karafotis posted a patch for the Intel P-State code today that changes the calculation method for the next pstate. Stratos wrote on the mailing list, "Currently the driver calculates the next pstate proportional to core_busy factor and reverse proportional to current pstate. Change the above method and calculate the next pstate independently of current pstate."

Using a Core i7 3770, this kernel developer tested his P-State findings using the Phoronix Test Suite. He found that the kernel compilation performance was faster by about 1.5% in our benchmark. The overall test time was reduced by about 2.6% while the total energy consumption during a test iteration was lower by about 0.35%.

Let's hope this tuning work will continue and we'll see better performance out of the P-State driver for modern hardware with the Linux 3.16 kernel. Our benchmarks of all the Linux 3.15 kernel changes are forthcoming now that the code for this kernel cycle is starting to stabilize.

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. Intel Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  2. Intel 120GB 530 Series SSD Linux Performance
  3. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
  4. AMD's Windows Catalyst Driver Remains Largely Faster Than Linux Drivers
Latest Linux Articles
  1. Mesa Git Yields Performance Improvements For Newer AMD GPUs
  2. Apple OS X 10.10 vs. Ubuntu 14.10 Performance
  3. Mesa 10.5-devel Brings Some Intel Haswell HD Graphics Changes Over Mesa 10.3
  4. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
Latest Linux News
  1. Quantum OS Aims For A Linux Desktop With QML, Wayland & Material Design
  2. New Open-Source, Linux Benchmarks To Feast On
  3. FreeBSD Plans For The Next Ten Years
  4. Qt 5.4 Planned For Release On 9 December
  5. Meizu's Ubuntu Phone Not Expected Until Early Next Year
  6. DragonFlyBSD 4.0 Drops i386 Support, Improves Graphics
  7. Expensive "Free/Libre Software Laptop" Uses A NVIDIA GPU
  8. QEMU 2.2-rc3 Released, Final Release Pushed Back By Couple Days
  9. 64-bit ARM FreeBSD Support Is Taking Shape
  10. GCW Zero Starts Seeing New Game Releases
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Hurrican SDL Port
  3. Roadmap to Catalyst 14.10 ?
  4. how to configure module phoromatic ?
  5. PulseAudio 6.0 Is Coming & Other Linux Audio Plans For The Future
  6. Debian Developer Resigns From The Systemd Maintainership Team
  7. Cant get working Kaveri APU - A10-7850k
  8. Script for Fan Speed Control