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

Ondemand vs. Performance CPU Governing For AMD FX CPUs On Linux 3.17

Michael Larabel

Published on 2 September 2014
Written by Michael Larabel
Page 1 of 4 - 17 Comments

Given recent comments by Phoronix readers, here are some fresh results from the AMD FX-9590 Eight-Core CPU when testing the different CPU scaling governors with the CPUfreq driver on the Linux 3.17 kernel.

In the tests shared yesterday of looking at the AMD FX-9590 CPU on Linux and other CPU benchmarks from this weekend, some Phoronix readers raised concerns about the CPU scaling governor differences between the AMD and Intel hardware. The AMD FX CPUs continue to use the CPUfreq driver by default to handle their scaling while modern Intel CPUs have the new Intel P-State driver. Beyond the Intel-specific P-State vs. CPUfreq, the AMD CPUs generally default to using the "ondemand" governor while with Intel desktop CPUs on P-State it generally ends up with the "performance" mode. Some Phoronix readers found performance vs. ondemand differences to be unfair, but for AMD FX CPUs, there isn't much of a difference in our common CPU torture test benchmarks found in the Phoronix Test Suite.

To clear up any confusion, with the AMD FX-9590 I ran some of the same CPU benchmarks while measuring the impact between CPUFreq's ondemand and performance scaling governors. All benchmarks were handled by the Phoronix Test Suite, which was also measuring the reported CPU temperature and AC system power usage. This data is shared over the next few pages for this eight-core processor that boasts a 4.7GHz base clock frequency and 5.0GHz turbo frequency.

For those that missed it, earlier this year I did an Intel P-State vs. CPUfreq Comparison as an equivalent Intel article to these AMD Linux benchmarks

Latest Articles & Reviews
  1. Samsung 850 EVO SSD Linux Benchmarks
  2. Kubuntu 15.04 Is Turning Out Quite Nice, Good Way To Try Out The Latest KDE
  3. 5-Way Linux Distribution Comparison On The Core i3 NUC
  4. OCZ ARC 100 Linux SSD Benchmarks
  5. Lenovo ThinkPad X1 Carbon Works Great As A Linux Ultrabook
  6. Transcend SSD370 256GB
Latest Linux News
  1. Linux 4.0 & LLVM vs. GCC Yielded Much Interest This Month
  2. XBMC/Kodi 15.0 Alpha 1 Released
  3. Xfce 4.12 Released After Nearly Three Years Of Work
  4. The Khronos Group Filed A Trademark On "Vulkan" API
  5. Mozilla Thunderbird Adoption Climbs, Thunderbird 38 In May
  6. The Most Popular Linux Benchmark Results On OpenBenchmarking.org
  7. Intel's Graphics Driver For Linux 4.1 Will Have More XenGT vGPU Support
  8. PlayOnLinux 4.2.6 Fixes A Number Of Issues
  9. Mesa 10.5-RC3 Now Available To Test Improved GPU Drivers
  10. New Specifications On The Alleged Ubuntu Tablet
Most Viewed News This Week
  1. Linux 4.0-RC1 Tagged, Linux 4.0 Will Bring Many Notable Improvements
  2. Screenshots Of The GNOME 3.16 Changes
  3. More Proof That Allwinner Is Violating The GPL
  4. Linux 4.0 Doesn't Have The Weirdest Codename
  5. Mir Now Depends Upon C++14
  6. Krita 2.9 Released, Their Biggest Release Ever
  7. The Tremendous Features Of Fedora 22
  8. GNOME 3.16 Beta Brings Wayland-Based Log-in Screen
%%CLICK_URL_UNESC%%