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 MATE 17.04 Final Beta Is Out with MATE 1.18, Drops 32-bit PowerPC Support

Ubuntu MATE leader Martin Wimpress is informing Softpedia today about the immediate availability of the Final Beta release of the upcoming Ubuntu MATE 17.04 (Zesty Zapus) operating system, due for release on April 13, 2017. Read more Also: Ubuntu 17.04 Final Beta Released

Today in Techrights

Leftovers: OSS

  • Are Low-Code Platforms a Good Fit for Feds?
    Open-source code platforms — in part, because they’re often free — have long been a popular choice for digital service creation and maintenance. In recent years, however, some agencies have turned to low-code solutions for intuitive visual features such as drag-and-drop design functionality. As Forrester Research notes, low-code platforms are "application platforms that accelerate app delivery by dramatically reducing the amount of hand-coding required."
  • Crunchy Data Brings Enterprise Open Source POSTGRESQL To U.S. Government With New DISA Security Technical Implementation Guide
    Crunchy Data — a leading provider of trusted open source PostgreSQL and enterprise PostgreSQL technology, support and training — is pleased to announce the publication of a PostgreSQL Security Technical Implementation Guide (STIG) by the U.S. Department of Defense (DoD), making PostgreSQL the first open source database with a STIG. Crunchy Data collaborated with the Defense Information Systems Agency (DISA) to evaluate open source PostgreSQL against the DoD's security requirements and developed the guide to define how open source PostgreSQL can be deployed and configured to meet security requirements for government systems.
  • Democratizing IoT design with open source development boards and communities
    The Internet of Things (IoT) is at the heart of what the World Economic Forum has identified as the Fourth Industrial Revolution, an economic, technical, and cultural transformation that combines the physical, digital, and biological worlds. It is driven by such technologies as ubiquitous connectivity, big data, analytics and the cloud.

Software and today's howtos