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427fee3507
This enables L3 partial write merging for a number of cases that seem to be getting accidentally disabled by the kernel, which was causing a serious performance bottleneck on DG2 and MTL platforms. The "Compressible Partial Write Merge Enable", "Coherent Partial Write Merge Enable" and "Cross-Tile Partial Write Merge Enable" bits in L3SQCREG5 were expected to be enabled by default (and confusingly, they even read off as enabled if you ran 'intel_reg read 0xb158' on an idle system), but they are getting clobbered during 3D context initialization by an i915 workaround. Enabling L3 partial write merging of compressible surfaces in particular seems to increase rendering fillrate by over 3x in some cases (e.g. the "VulkanFillRate/FillRateGPU/resolution:1[0-3]/format:*/blend:0" fillrate-bound microbenchmarks). Significant improvements can also be reproduced in most real-world workloads we've tested so far, e.g. Counter Strike GO improves by ~11%, Shadow Of the Tomb Raider improves by ~5.5%, and AztecRuins-VK improves by ~6.5% on DG2-512 -- Thanks a lot to Caleb Callaway for these figures. No regressions have been observed so far. Even though this patch might strike as surprisingly simple for such a large payoff, it's the result of Felix DeGrood and I trying to root-cause the rendering performance gap of DG2 on Linux vs Windows on and off during the last year, and some of the OA statistics captured by Felix early this month were greatly helpful for me to connect the last few dots, so Felix deserves a big chunk of the credit for this work. Cc: mesa-stable Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23783> |
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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 `OFTC's #dri-devel <irc://irc.oftc.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.