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. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  2. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
  3. Trying The Configurable 45 Watt TDP With AMD's A10-7800 / A6-7400K
  4. Sumo's Omni Gets Reloaded
Latest Linux Articles
  1. 20-Way Radeon Comparison With Open-Source Graphics For Steam On Linux Gaming
  2. Preview: OS X 10.10 Yosemite vs. Ubuntu Linux GPU Performance
  3. Radeon Graphics Yield Mixed Results With Linux 3.17 Kernel
  4. AMD's RadeonSI Driver Sped Up A Lot This Summer
Latest Linux News
  1. Nouveau On Oibaf PPA Is Back To Running Well
  2. Metro 2033 Redux Will Hopefully Hit Linux Real Soon
  3. New Virtual Monitor Software Might End Up On Linux
  4. Company of Heroes 2 Might Be Coming Out For Linux
  5. NIR Still Being Discussed For Mesa, LLVM Gets Brought Up Again
  6. Plasma Active Is Mostly Ported To KDE Frameworks 5
  7. Google Chrome 37 Brings Many Security Fixes
  8. MenuetOS Updated With SMP Threads & Onscreen Keyboard
  9. Mesa Has A New Release Manager
  10. Enlightenment E19 Lands Its New Wayland Compositor Code
Latest Forum Discussions
  1. AMD Releases UVD Video Decode Support For R600 GPUs
  2. Announcing radeontop, a tool for viewing the GPU usage
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. [DB] BIOS - ACPI - data collecting
  5. It's Now Possible To Play Netflix Natively On Linux Without Wine Plug-Ins
  6. Users defect to Linux as OpenBSD removes Lynx from base system
  7. Chinese People Try To Patent Wine On ARM
  8. American Citizens running AMOK for food stamps