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 Benchmarking Platform
Phoromatic Test Orchestration

Another Major Linux Power Regression Spotted

Michael Larabel

Published on 25 April 2011
Written by Michael Larabel
Page 2 of 4 - 38 Comments

The hardware for the ThinkPad R52 used in this article is an Intel Pentium M 1.86GHz, 2GB of system RAM, 80GB Hitachi IDE HDD, and ATI Mobility Radeon X300 graphics. Besides the vanilla kernels, the Ubuntu 8.04.4 LTS user-space was used with GNOME 2.22.3, X Server 1.4.0.90, xf86-video-ati 4.3.0, Mesa 7.0.3-rc2, GCC 4.2.4, and the EXT3 file-system.

The first graph is simply showing the Ubuntu Hardy Heron desktop idling for a period of two minutes before any tests are carried out. In this first test, it shows that even while idling from the Linux 2.6.34 to 2.6.35 kernels there is a spike in power consumption with the average going from 16.7 Watts to 20.6 Watts. With the Linux 2.6.38 kernel on Ubuntu 8.04.4 LTS it goes up to 21.9 Watts, which also shows that the 2.6.38 regression isn't related to any user-space interaction problems in Natty or Maverick where the focused kernel tests were carried out last week.

In the second test, it is the notebook idling, and then idling with the display flipped off via DPMS, and then flipped back on again for MPlayer to run a brief video test. The power consumption results during the video playback are mixed, but the overall average still highlights the 2.5.35 and 2.6.38 kernels vastly setting back Linux power management for the ThinkPad notebook.

Latest Articles & Reviews
  1. Radeon Linux Benchmarks: Catalyst 15.3 Beta vs. Linux 4.0 + Mesa 10.6-devel
  2. Trying Out The Modern Linux Desktops With 4 Monitors + AMD/NVIDIA Graphics
  3. Turning A Basement Into A Big Linux Server Room
  4. NVIDIA's $1000+ GeForce GTX TITAN X Delivers Maximum Linux Performance
  5. OS X 10.10 vs. Ubuntu 15.04 vs. Fedora 21 Tests: Linux Sweeps The Board
  6. The New Place Where Linux Code Is Constantly Being Benchmarked
Latest Linux News
  1. Blender 2.74 Brings Many Improvements
  2. Qt Creator 3.4 Is Near
  3. Allwinner: "We Are Taking Initiative Actions Internally"
  4. It's Been Five Years Since The Phoronix Visit To Chernobyl
  5. Vulkan, The New Linux Server Room & BioShock Won Linux Users In March
  6. Debian 8.0 Jessie Gets A Release Date
  7. Firefox 37 Coming Today With Heartbeat, HTTPS Bing
  8. OpenIndiana 2015.03 Updates Its Solaris/Illumos Environment
  9. GNOME 3.16 SDK Runtime Now Available
  10. Initial Intel Braxton Support Might Come To Linux 4.1
Most Viewed News This Week
  1. The Big Features Of The Linux 4.0 Kernel
  2. Improved OpenCL Support For Blender's Cycles Renderer
  3. Open-Source Driver Fans Will Love NVIDIA's New OpenGL Demo
  4. Allwinner Continues Jerking Around The Open-Source Community
  5. GNOME 3.16 Released: It's Their Best Release Yet
  6. Ubuntu 15.04 Final Beta Released
  7. Nuclide: Facebook's New Unified IDE
  8. LibreOffice Online: A Cloud Version Of LibreOffice