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Intel and AMD in Linux: Intel Uncore Frequency, Per-Client Engine Busyness, Navi GPUs

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Linux
Hardware
  • Intel Uncore Frequency Driver On Linux Is Closer To Mainline With Latest Patches

    The Intel Uncore Frequency driver for Linux allows reading and setting the uncore frequency, which controls the RING / Last Level Cache (LLC) clocks. Increasing the uncore frequency can help with improving memory latency or at least making the latency consistent by avoiding the dynamic uncore frequency selection. Increasing the clocks obviously come with increased power/heat. By default, the Intel uncore frequency is dynamic based upon the CPU performance state and power constraints.

    Intel has long published as part of their data sheets that the uncore frequency is controlled via a specific MSR (register 0x620) while now the intel_uncore frequency driver makes it easy to read and manipulate it from user-space. Interested server administrators could already manipulate the MSR as desired, but the Intel Uncore Frequency Linux driver makes it very easy now to read and set via new sysfs interfaces.

  • Intel Revs Linux Patches For Per-Client Engine Busyness - Allowing For Great GPU Insight

    One of the set of patches for Intel's Linux kernel graphics driver that have been floating around for more than one year is about exposing per-client (process) statistics in how each application is making use of the GPU's render/blitter/video hardware and various insightful statistics related to that. The patches aren't queued for mainline yet but at least a new revision of the work was published.

  • RADV's Next-Gen Geometry Code Continues To Be Revised For Navi GPUs

    The NGG (Next-Gen Geometry) support with Navi continues to be refined by the open-source AMD Linux graphics drivers with the RADV Vulkan driver seeing a fresh batch of fixes/clean-ups, inspired in part by the NGG code from the RadeonSI and AMDVLK drivers.

    The latest batch of RADV NGG work comes via Valve open-source driver developer Samuel Pitoiset. Landing in Mesa 20.0-devel today is a performance optimization, support for the NGG passthrough mode, disabling of vertex grouping, and other tweaks.

    Nothing too major itself but the latest in a long series of NGG activity for the open-source AMD Linux graphics drivers.

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