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Thanks to Felix Degrood for discovering that we missed enabling this additional caching on Tigerlake! Felix also benchmarked the changes. We now use MOCS 48 (HDC:L1 + L3 + LLC) for render targets, textures, and pull constant buffers. We leave storage buffers & images, as well as stateless messages, using the previous MOCS 2 value. We can't use HDC:L1 with atomics, and we don't know a priori whether storage buffers will be used with atomics or not. Similarly, the Vulkan buffer device address feature allows atomics to be performed on buffers via stateless messages, and we only can control MOCS at the base address level, so we can't do much there. This is closer to what the Windows Vulkan and OpenGL drivers do, though it isn't quite the same - they also disable LLC in some cases, but we observed this to have noticable performance regressions when we tried (though a couple titles benefited). We may try experiment with that in the future. Improves performance in a number of titles: - Unreal Engine 4 Shooter Demo [VK]: 11.8% - Witcher 3 [DXVK]: 3.9% - Rise of the Tomb Raider [VK]: 1.5% - Shadow of the Tomb Raider [VK]: 1.0% - Grand Theft Auto V [DXVK]: 0.8% We did not observe any performance regressions. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7104> |
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `Freenode's #dri-devel <irc://chat.freenode.net#dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.