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

Open source licensing: What every technologist should know

If you’re a software developer today, you know how to use open source software, but do you know how and why open source licensing started? A little background will help you understand how and why the licenses work the way they do. Read more

Kali Linux 2017.2 Release

We are happy to announce the release of Kali Linux 2017.2, available now for your downloading pleasure. This release is a roll-up of all updates and fixes since our 2017.1 release in April. In tangible terms, if you were to install Kali from your 2017.1 ISO, after logging in to the desktop and running ‘apt update && apt full-upgrade’, you would be faced with something similiar to this daunting message: Read more Also: Kali Linux 2017.2 Released With New Hacking Tools — Download ISO And Torrent Files Here

Open source-based business lessons from a seasoned CEO

The default now is to build from open and in the open. So that's a positive. The downside is that by open source being the default, we may be getting a little lazy. If you remember back 5-10 years, open sourcing was a big deal, and it forced a level of rigor that may have led, in some cases, to founders and early investors taking better approaches to building their company—for example, shifting towards SaaS wherever possible, in part because of the ability to demonstrate clear value versus their own open source. Read more

Keeping up with advances in open source database administration

The world of open source databases is rapidly evolving. It seems like every day brings a new release of an open source technology that might make a database administrator's life easier, if only he or she knew about it. Fortunately, there are many ways to stay on top of what's going on with open source database technology. One such way is the Percona Live Open Source Database Conference, taking place next week in Dublin, Ireland. We've covered Percona Live before, and invite you to take a look back at some of our previous stories. From IoT to big data to working with the cloud, there's plenty to keep up with. Here are a look at a couple of the sessions you might enjoy, as described by the speakers. Read more