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AMD and Linux: AMDVLK 2021.Q1.1, Compiler Benchmarks, AMDGPU and More

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  • AMDVLK 2021.Q1.1 Brings Switchable Graphics Layer, RDNA 2 Tuning - Phoronix

    AMDVLK 2021.Q1.1 is out this morning as the first update of the year for the open-source official AMD Vulkan Linux driver and it's an exciting update.

    AMDVLK 2021.Q1.1 brings the recently reported on Vulkan layer that makes it very easy to switch between AMDVLK and RADV drivers. With the new driver installed and the Vulkan layer activated, setting the AMD_VULKAN_ICD=RADV environment variable instead will cause RADV to be used.

  • AMD make switching between Vulkan drivers AMDVLK and RADV easier | GamingOnLinux

    On Linux with AMD GPUs you can decide between the RADV and AMDVLK drivers for Vulkan API support, and it appears AMD want to make things a little easier for you.

    It can get a little confusing so here's the real basics: AMDVLK is the "official" external Vulkan driver developed by AMD, whereas RADV is part of Mesa and comes with most distributions by default. Sometimes certain games work better on one, sometimes on the other. Additionally, AMD only directly support Ubuntu and Red Hat, whereas Mesa with RADV focuses on everything they can.

    With the latest AMDVLK 2021.Q1.1 release, AMD has made switching between the two a little easier. With this driver installed, you only need to set an environment variable to tell whatever game or application you're using what driver to use with "AMD_VULKAN_ICD" set to either "AMDVLK" or "RADV". The default is AMDVLK of course, if none is set.

  • AMD Ryzen 9 5950X + GCC 11 Compiler Benchmarks At Varying Optimization Levels - Phoronix

    Following last month's initial benchmarks of the AMD "znver3" support that landed in the GCC 11 compiler was a request by a premium supporter to see the AMD Zen 3 benchmarks at more compiler optimizations. Well, here are those numbers for those wanting to pursue aggressive compiler optimizations on a shiny AMD Ryzen 9 5950X.

    As outlined last month, GCC 11 now has the initial "-march=znver3" CPU target support. However, this is basically a copy of the Zen 2 GCC code at this point with the few new Zen 3 instructions flipped on. There isn't yet any optimized scheduler model or other performance enhancements over the existing Znver2 support. So this articles does include both znver2 and znver3 runs for those interested.

  • AMD GPU Driver In Linux 5.12 Gets RX 6000 Series OverDrive, FP16 For More Hardware - Phoronix

    The first of several batches of feature updates to the AMDGPU kernel driver were sent in on Friday for anticipation of the Linux 5.12 kernel merge window that should be opening up in February while the stable Linux 5.12 debut will happen likely by/around May. With this initial pull does come some new features and improvements around the recent AMD graphics processor support additions.

    Likely of most interest to users out of this initial set of AMDGPU driver changes queuing in DRM-Next is the OverDrive overclocking for the Radeon RX 6000 series. This was one of the features not initially present by the AMDGPU Linux driver but is now squared away and ready to go. As with existing OverDrive Linux support, it's exposed via sysfs for command-line based overclocking but could be implemented by those interested as a GUI control utility - just nothing officially from AMD.

  • A Linux Fix Is On The Way For Some GPUs Having AMD Smart Access Memory Issue - Phoronix

    A Linux fix is on the way for a new quirk to address an issue whereby some AMD Radeon graphics cards have an issue with the resizable BAR (AMD Smart Access Memory) handling that could lead to lower performance.

    The quirk is about allowing BAR0 resizing to be done even for PCI Express graphics cards that don't advertise Resizable BAR support for a size large enough to span the entire video memory size but at least larger than the default.

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