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

<< Previous Page
1
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. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
  2. Is The Open-Source NVIDIA Driver Fast Enough For Steam On Linux Gaming?
  3. Linux 3.18 File-System Performance Minimally Changed But Possible Regressions
  4. AMD Radeon Gallium3D Is Catching Up & Sometimes Beating Catalyst On Linux
Latest Linux News
  1. Linux 3.18 Kernel: Not Much Change With Intel Haswell Performance
  2. More File-System Tests Of The Linux 3.18 Kernel
  3. Using NVIDIA's NVENC On Linux With FFmpeg
  4. There's Talk Again About An "Open To The Core" Ubuntu Laptop
  5. PowerVR SGX Driver Code Gets Leaked
  6. V2 Of KDBUS Published For Linux Kernel Review
  7. VirtualBox 4.3.20 Arrives, Still No Sign Of VirtualBox 4.4
  8. Scientific Linux 6.6 vs. Scientific Linux 7.0 Benchmarks
  9. Qualcomm Looks To Get Into The ARM Server Business
  10. HHVM 3.4 Adds New Features, Support
Latest Forum Discussions
  1. Roadmap to Catalyst 14.10 ?
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. Cant get working Kaveri APU - A10-7850k
  4. Debian Developer Resigns From The Systemd Maintainership Team
  5. Script for Fan Speed Control
  6. Debian Init System Coupling Vote Results
  7. The Slides Announcing The New "AMDGPU" Kernel Driver
  8. Ubuntu Developers Still Thinking What To Do About Adobe Flash Support