Language Selection

English French German Italian Portuguese Spanish

Another Major Linux Power Regression Spotted

Filed under
Linux

Since Friday there's been a number of Phoronix articles about a very bad power regression in the mainline Linux kernel, which is widespread, Ubuntu 11.04 is one of the affected distributions, and has been deemed a bug of high importance. This yet-to-be-resolved issue is affected Linux 2.6.38 and 2.6.39 kernels and for many desktop and notebook systems is causing a 10~30% increase in power consumption. Nevertheless, this is not the only major outstanding power regression in the mainline tree, there is another dramatic regression now spotted as well that is yet-to-be-fixed.

Since the discovery last week of the Linux 2.6.38 and 2.6.39 kernels going through excessive amounts of power compared to 2.6.37 and earlier, each day and practically all day since that time has been working on Linux power consumption tests. Power consumption benchmarks are not normally an area we focus on nor do many others, but since the inadvertent discovery of it when testing out the power consumption of past Ubuntu Linux releases, a lot of time has spent investigating the matter within the kernel. In order to do such, there's been continued improvements to the Phoronix Test Suite, Phoromatic, OpenBenchmarking.org, and the PTS Commercial scripts for better enhancing the power testing, more improvements to multi-point automated regression bisecting, etc. The Phoronix Test Suite has already been able to monitor and log the power consumption (along with temperatures, fan speeds, I/O wait, system load, etc) for any test profile/suite being run by using the system monitor module, but now there is more. Thanks to working on that Easter weekend, coming to fruition because of that today is the discovery of another regression while still working on finding the first commit causing a power regression.

rest here




More in Tux Machines

Fixing unperceived errors in my X Windows configuration

Last week I decided to bite the bullet and upgrade X Windows to the latest version available in the main Portage tree. After rebooting, X Windows, GLX and Direct Rendering worked fine as usual. So everything was good. Well, not quite. Although the installation was working properly, there were still some long-standing messages in the X.Org log file that indicated my installation was not configured completely correctly. I had ignored them for too long and resolved to find their causes and eliminate them. Here is what I did.

Read more

Leftovers: Software

  • Ekiga 5 – Progress Report
    Ekiga 5 has progressed a lot lately. OpenHUB is reportin a High Activity for the project. The main reason behind this is that I am again dedicating much of my spare time to the project. Unfortunately, we are again facing a lack of contributions. Most probably (among others) because the project has been silent during several years.
  • Calibre Gets a New Tool to Better Edit eBooks
    The Calibre eBook reader, editor, and library management software has been upgraded to version 2.17 and is now available for download. The developer has only implemented a couple of new features, but it's really worth the update if you are using this application to edit eBooks.
  • More Windows Apps and Games Now Work with Wine 1.7.35, EA's Origin Included
    Wine 1.7.35 has been released and the developers have made a number of improvements for some of the core components and they've added support for more apps and games.

today's howtos

Leftovers: Gaming

  • Dying Light Action Survival Game Coming to Steam January 27
    Dying Light, a modern first-person survival horror game set in a world hit by plague, is now available for pre-purchase on Steam and will be available for download on January 27.
  • Dying Light FPS Has Been Confirmed for Linux, Zombies Galore
    Techland is preparing to launch Dying Light, a new FPS with amazing graphics and hordes of zombies. The developer has revealed that it will also have a Linux version, right from the start.
  • Dying Light Is Now Confirmed For Linux, Bring It On Techland
    Dying Light is now confirmed for Linux thanks to the announcement from the developers on the Steam store itself. The Linux icons show up on the store pages, and the game even has a steam coming soon banner on the home-page. Time to get seriously excited.
  • Star Traders: 4X Empires Strategy Game Now On Linux
  • 5 reasons Valve's Steam Machine dream is still very alive
    Steam Machines? More like has-been machines, am I right? Actually, no: while many people are giving Valve's PC-console-hybrids the cold shoulder, this gamer reckons they'll be worth the wait. I realise that I'm part of a shrinking group still backing Valve's SteamOS-powered Linux boxes, and it's not difficult to see why the hype around them has all but evaporated. Several controller-related delays, U-turns by seemingly committed hardware partners and a lack of news from the top has made many think that Valve is blowing hot air.