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The TFU stride-0 fill path allocates a 64 KiB staging BO (V3D_TFU_MAX_DIM * cpp = 16384 * 4), maps it, fills it with the pattern, and caches it on the command buffer. For non-zero patterns the per-cmd-buffer cache works well, but WebGPU/Dawn workloads issue many zero-fills (lazy buffer init) across separate command buffers, so the cache misses almost every time and each fill pays for a fresh alloc + mmap + memcpy. Add a device-wide staging BO held in v3dv_device::meta.tfu_fill_zero, lazily allocated under meta.mtx and used whenever data == 0. The BO is read-only after init so it can be shared across queues without extra synchronization, and it is freed in destroy_device_meta. Measured on a Dawn/WebGPU zero-fill-heavy workload (RPi5, ~60 meta_fill_buffer calls, ~218 MiB total, all zero-fills): before: TFU branch total 7.328 ms, avg 115.55 us/call after: TFU branch total 0.296 ms, avg 4.78 us/call (~24x) Non-zero patterns continue to use the per-cmd-buffer cache. Assisted-by: Claude Opus 4.7 Reviewed-by: Iago Toral Quiroga <itoral@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41725> |
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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://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_): .. code-block:: sh $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ 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://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.