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RADV Lands VK_EXT_subgroup_size_control For Exposing Wave32 On Navi/GFX10

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  • RADV Lands VK_EXT_subgroup_size_control For Exposing Wave32 On Navi/GFX10

    Phoronix: RADV Lands VK_EXT_subgroup_size_control For Exposing Wave32 On Navi/GFX10

    Valve open-source developer Samuel Pitoiset has landed his work enabling the Vulkan VK_EXT_subgroup_size_control extension that for GFX10/Navi is being used to expose Wave32 capabilities...

    http://www.phoronix.com/scan.php?pag...-Subgroup-Size

  • #2
    So something like dxvk would need to explicitly make use of it, to benefit from wave32?

    Aco wave32 is currently work in progress: https://gitlab.freedesktop.org/Venem...co-navi-wave32

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    • #3
      I don't think Wave32 is always better, so it should be enabled/used by the software.

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      • #4
        Also, does it only affect compute shaders, or other shaders can benefit from wave32 too?

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        • #5
          Originally posted by shmerl View Post
          So something like dxvk would need to explicitly make use of it, to benefit from wave32?
          Wave32 is not currently the default, but you can opt to use it with a couple of environment variables. It doesn't yield a significant enough benefit, and is not always better, as far as I've played around with it.

          Originally posted by shmerl View Post
          Aco wave32 is currently work in progress: https://gitlab.freedesktop.org/Venem...co-navi-wave32
          Please don't use that branch yet, that is some pretty old code there and it has a number of unsolved problems. You will hear from it when it's ready.

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          • #6
            Originally posted by Venemo View Post
            Please don't use that branch yet, that is some pretty old code there and it has a number of unsolved problems. You will hear from it when it's ready.
            I didn't use it yet, just saw that it's there

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