Language Selection

English French German Italian Portuguese Spanish

Linux: Tuning CFS

Filed under
Linux

Nick Piggin used 'git bisect' to track a lmbench regression to the main CFS commit, leading to an interesting discussion between Nick and Ingo Molnar. Ultimately the regression was tracked down to the temporary configurability of the scheduler while it is tuned for optimal performance, "one reason for the extra overhead is the current tunability of CFS, but that is not fundamental, it's caused by the many knobs that CFS has at the moment." The solution, already coded but not yet merged in the mainline kernel "changes those knobs to constants, allowing the compiler to optimize the math better and reduce code size," and as a result result, "CFS can be faster at micro-context-switching than 2.6.22."

Ingo described the lmbench configuration in question as a "micro-benchmark", and noted that with a macro-benchmark better performance was more pronounced, "because with CFS the _quality_ of scheduling decisions has increased.

More Here




More in Tux Machines

Ubuntu 14.04, Highly Recommended by the Engineers of Dell

Barton George, Dell’s Director of Developer Programs has stated in a blog post that the necessities of programmers have ground and they wanted to have a bigger and better version of a laptop that runs Ubuntu Linux and that’s how they thought about the Precision M3800. Not much they, but him, Jared Diminguez, a Dell software engineer that has gathered all data and combined it with his grand passion, in order to make big efforts seem as easy as batting one’s eyelashes. Read more

Witcher 2 Bug Prompts Linux Creator To Recommend Devs Play Steam Games

It’s common for NVIDIA and AMD to tweak their drivers to optimise specific titles, but patches to operating systems just for games? Usually developers work around platform quirks, but that’s not good enough for Linus Torvalds, the man behind Linux. When crashes in The Witcher 2 were caused by Linux’s core software, Torvalds not only requested the bug be fixed, but that Steam games should be used in the future as “good tests of odd behaviour”. Read more

Today in Techrights

FileZilla 3.10.1 Released With Bug Fixes And Some Minor Changes Install In Ubuntu/Linux Mint


Picture

FileZilla is free and Open-Source ftp/sftp client with features FTPSFTP and FTPS (FTP over ssl/TLS). It has a very nice and easy to use user interface.FileZilla 3.10.1 released yesterday with bug fixes and minor changes.
 
 
 
 
 
 

Read at LinuxAndUbuntu