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

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. 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. Open-Source .NET On Linux Continues Maturing
  2. Features Coming For The Imminent Xfce 4.12 Release
  3. Canonical's Latest Demo Of Ubuntu Unity 8 Convergence In Action
  4. The Quest For Decent, Low-Priced Server Cases & Racks/Cabinets
  5. Mesa 10.5 Is In Ubuntu 15.04 For The Latest Open-Source GPU Drivers
  6. ALSA 1.0.29 Released
  7. Ubuntu 15.04 Beta Released, Ubuntu MATE Made Official
  8. Coreboot Developer: Purism Doesn't Deliver On Libre Firmware
  9. LLVM 3.6 & Clang 3.6 Deliver More Features, Complete C++14 Support
  10. The Most Popular Open-Source Linux Benchmarks
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. Linux 4.0 Doesn't Have The Weirdest Codename
  4. Mir Now Depends Upon C++14
  5. More Proof That Allwinner Is Violating The GPL
  6. GNOME 3.16 Beta Brings Wayland-Based Log-in Screen
  7. LLVM Clang Compiling The Linux Kernel Is A Big Topic For 2015
  8. Canonical Comes Up With Its Own FUSE Filesystem For Linux Containers
%%CLICK_URL_UNESC%%