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Kernel: ENQCMD, Mesa, and Wayland

Submitted by Roy Schestowitz on Sunday 20th of June 2021 03:39:11 PM Filed under
Linux

  • Linux 5.13 Lands More Fixes To The Mucked Up FPU/XSTATE Handling Mess - Phoronix

    Earlier this month Linux 5.13 disabled Intel's ENQCMD functionality for upcoming Xeon "Sapphire Rapids" processors as the kernel software code around it was deemed "broken beyond repair". More of the recent Intel-submitted patches around reworking kernel code in preparation for upcoming CPU features has been found to be rather hairy after already being mainlined and thus another batch of urgent x86 fixes were sent in this morning.

    Over the past year has been a lot of low-level x86 (x86_64) kernel code changes around Intel's Linux 5.13 disabled Intel's ENQCMD functionality for upcoming Xeon "Sapphire Rapids" processors as the kernel software code around it was deemed "broken beyond repair". This stems from changes contributed by Intel over the past year around XSAVES supervisor states and preparing the kernel for Control-Flow Enforcement Technology (CET), Intel Processor Trace (PT), ENQCMD with Sapphire Rapids, and other features needing supervisor extended states (xstate) handling.

  • Mesa Lands Work Around Async glFlush - Should Help Workstation Performance - Phoronix

    While vendors are increasingly just focused on Vulkan (and Direct3D under Windows), there still is plenty of OpenGL software out there especially in the workstation space where software vendors are slow to adapt. Well known RadeonSI OpenGL developer Marek Olšák of AMD landed another performance optimization this week that should benefit the likes of SPECviewperf.

    This year we have seen Marek and AMD's other open-source driver developers working on workstation optimizations with optimizing their Gallium3D driver against SPECviewperf and making other improvements in this year.

  • Surface Suspension Protocol Proposed For Wayland - Phoronix

    Joshua Ashton who is known for his work on DXVK (formerly D9VK) and related Steam Play / Proton graphics related efforts has submitted a proposal for a Wayland Surface-Suspension protocol.

    The proposed "surface-suspension" protocol is about being able to know if/when a surface has been fully occluded/hidden. This is important with some Wayland compositors suspending the client's windows' buffers under such conditions.

    With games/applications potentially hanging if the buffers are suspended when hidden from view, the Wayland Surface Suspension protocol can be quite practical. The proposal would allow for providing events when a surface buffer is suspended and then restored. In turn the windowing system integration and graphics APIs can handle these surface suspension events to take proper action. Knowing this information could also allow for possible efficiency gains around memory management and the like when being able to reliably know if a surface's buffer is suspended.

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