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 Linux Hardware Reviews
  1. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
  2. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
  3. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
  4. RadeonSI Gallium3D vs. Catalyst At 4K UHD On Linux
Latest Linux News
  1. Mesa Gets Closer To Having OpenGL 4.0 Tessellation Support
  2. Uselessd: A Stripped Down Version Of Systemd
  3. F2FS Tools Gain FSCK Support
  4. FreeBSD 10.1 Has The New VT Driver, Hardware Improvements
  5. AntiMicro 2.6 Yields Greater Compatibility For Gamepads On Linux
  6. OpenGL 3.3 / GLSL 3.30 Lands For Intel Sandy Bridge On Mesa
  7. AMD's RadeonSI Gallium3D Driver Sees Some Improvements
  8. Mesa 10.3 Released With The Latest Open-Source GPU Driver Improvements
  9. GNOME 3.13.92 Officially Released
  10. Wine 1.7.27 Is Still Working Towards Direct2D Support
Latest Forum Discussions
  1. New stress testing utility for GPU's
  2. Stop grabbing my keyboard :(
  3. New Group Calls For Boycotting Systemd
  4. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  5. SSD seems slow
  6. R. Tyler restarts work on FreeBSD launchd port, openlaunchd
  7. Can Linux kill a motherboard?
  8. Glamor now enabled in Debian radeonsi