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Linux Kernel: VKMS, CAKE, Xen and AMDVLK

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Graphics/Benchmarks
Linux
  • Virtual Kernel Mode-Setting Driver Being Added To Linux 4.19

    Linux 4.19 is shaping up to be a pretty exciting kernel release for what is expected to be the last version before Linux 5.0.

    Adding to the list of Direct Rendering Manager (DRM) improvements in Linux 4.19, VKMS has been added to Linux 4.19. The VKMS driver is the virtual kernel mode-setting effort, most recently worked on as part of this year's Google Summer of Code.

    The virtual KMS driver is a basic KMS driver exposing a CRTC/encoder/connector/plane that can be used for headless machines to run an X.Org Server or even Wayland and serves for virtual display purposes without necessa

  • Networking CAKE Is Ready For Tasting With Linux 4.19

    For those maintaining their own home-built Linux router, Linux 4.19 is going to be pretty exciting: CAKE Qdisc has been merged into net-next, making it a feature for this next kernel cycle.

  • Latest Xen Hypervisor Arrives Late, but Greatly Improved
  • AMDVLK Vulkan Driver Now Supports Direct Display Mode For VR HMDs

    The AMDVLK open-source Radeon Vulkan Linux driver has seen its latest weekly code drop that brings with it some of the extensions needed for supporting the Steam VR experience.

    The AMDVLK driver now supports VK_EXT_direct_mode_display and VK_EXT_acquire_xlib_display extensions. These extensions are needed so a Vulkan application/compositor can take exclusive control of display(s), such as the use-case for virtual reality head-mounted displays (VR HMDs) with being controlled by the SteamVR compositor. The VK_EXT_acquire_xlib_display extension is needed for acquiring control of a display that is associated with an X11 screen from the X.Org Server.

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Linus Torvalds Comments On STIBP & He's Not Happy - STIBP Default Will End Up Changing

It turns out that Linus Torvalds himself was even taken by surprise with the performance hit we've outlined on Linux 4.20 as a result of STIBP "Single Thread Indirect Branch Predictors" introduction as well as back-porting already to stable series for cross-hyperthread Spectre V2 protection. He doesn't want this enabled in full by default. All of the benchmarking I've been doing the past few days to shine the light on the Linux kernel's STIBP addition appears to be paying off. My tests have found Linux 4.20 to incur significant performance penalties in many workloads -- in fact, more so than some of the earlier Spectre and Meltdown mitigations -- and STIBP is already being back-ported to stable series like Linux 4.19.2. PHP, Pythom, Java, and many other workloads are measurably affected and even the gaming performance to some extent. Read more

Submissions now open for the Fedora 30 supplemental wallpapers

Each release, the Fedora Design team works with the community on a set of 16 additional wallpapers. Users can install and use these to supplement the standard wallpaper. Submissions are now open for the Fedora 30 Supplemental Wallpapers, and will remain open until January 31, 2019 Have you always wanted to start contributing to Fedora but don’t know how? Submitting a supplemental wallpaper is one of the easiest ways to start as a Fedora contributor. Keep reading to learn how. Read more

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