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

GNOME and KDE

  • Community Time at Collabora [Ed: Mono]
  • Refocus
    Sometimes all those GNOME programming projects are driving me crazy. [...] Note that for that last item, I would use LaTeXila of course, so if there are some regressions due to some library changes (you perfectly know which library in particular I mean), I’ll probably become aware of the regressions and fix them. Without any guarantees, I repeat. So if someone wants to take over LaTeXila maintenance, I would be more than happy. In the condition that I can still recognize my old pet project afterwards and is still mostly bug-free.
  • Chakra GNU/Linux Users Get KDE Plasma 5.5.4 and Calligra 2.9.11 Office Suite
    Users of the Chakra GNU/Linux operating system were informed this past weekend by the project's maintainer Neofytos Kolokotronis of the availability of two essential software distributions for the rolling OS.
  • Konqi emoji shipped! and a little preview…
    It will end up in your KDE distribution soon !!! I am really very happy that many of you have appreciated my work.

Leftovers: Gaming

today's howtos

Kernel Space: Linux, Graphics