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

ACPI CPUfreq vs. Intel P-State Scaling With Linux 3.15

Michael Larabel

Published on 17 May 2014
Written by Michael Larabel
Page 1 of 6 - 19 Comments

For this weekend's Linux benchmarks we are looking at the performance of the Intel P-State and ACPI cpufreq drivers and comparing their scaling governor options when testing from an Intel Core i7 Extreme Edition system running with the Linux 3.15 development kernel.

Given that there's been renewed concerns recently about Intel's P-State driver causing odd performance problems and other performance issues related to the scaling governor, from the Linux 3.15 kernel this week I did some fresh tests of using both the intel_pstate and acpi_cpufreq drivers while also trying out their various scaling governor choices: performance, powersave, ondemand, conservative.

The system used for this testing was the Intel Core i7 4960X Ivy Bridge Extreme Edition system, which is clocked at 3.0GHz by default with a 4.0GHz Turbo frequency and has six physical cores plus Hyper Threading.

Furthering this testing of the CPU dynamic scaling options, the overall AC power consumption was also monitored for the Core i7 4960X EE system using the USB-based WattsUp power meter that is automatically polled via the Phoronix Test Suite when the MONITOR=sys.power PERFORMANCE_PER_WATT=1 environment variables are set to monitor not only the overall system power consumption but also the performance-per-Watt.

Using the Phoronix Test Suite, on the following pages are our results for this high-end Intel Ivy Bridge system when testing the Intel P-State driver with the performance governor (the system default), the Intel P-State driver with the powersave governor and then the ACPI CPUfreq driver when testing independently the ondemand, conservative, and performance governors. Those wishing to do their own tests an easy way to fall-back to using ACPI CPUfreq on modern Intel systems is by setting intel_pstate=disable as a kernel command-line argument when booting the modern kernel.

<< Previous Page
1
Latest Linux Hardware Reviews
  1. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  2. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  3. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  4. AMD Radeon R9 285 Tonga Performance On Linux
Latest Linux Articles
  1. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  2. MSI: Update Your BIOS From The Linux Desktop
  3. NVIDIA vs. AMD 2D Linux Drivers: Catalyst Is Getting Quite Good At 2D
  4. 15-Way GPU Comparison With Mesa 10.3 + Linux 3.17
Latest Linux News
  1. Features Of The Linux 3.18 Kernel
  2. Automatic Feedback Directed Optimizer Merged Into GCC
  3. Debian Now Defaults To Xfce On Non-x86 Desktops
  4. Phoenix Is Trying To Be An Open Version Of Apple's Swift
  5. Linux 3.19 To Have Skylake Graphics, PPGTT Enablement
  6. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  7. Imagination Releases Full ISA Documentation For PowerVR Rogue GPUs
  8. Features GNOME Developers Want In The Linux Kernel
  9. GTK+ Gains Experimental Overlay Scrollbars
  10. Phoronix Test Suite 5.4 M3 Is Another Hearty Update
Latest Forum Discussions
  1. Users/Developers Threatening Fork Of Debian GNU/Linux
  2. Proof that strlcpy is un-needed
  3. xbox one tv tuner
  4. HOPE: The Ease Of Python With The Speed Of C++
  5. Bye bye BSD, Hello Linux: A Sys Admin's Story
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux
  8. AMD Is Restructuring Again, Losing 7% Of Employees