Kenneth Graunke
9310ae6f68
Rafael Antognolli tracked down a performance gap between i965 and iris in Synmark2's OglCSDof microbenchmark, noting that iris was performing substantially more memory reads and writes, with substantially fewer L3 hits. He suggested that something might be wrong with MOCS, or L3 configs, at which point I came up with a theory... It would appear that the STATE_BASE_ADDRESS command updates the MOCS settings for various base addresses even if you don't specify the "Modify Enable" bit for that address. Until now, we had been setting only the MOCS for bases we intended to change, leaving the others "blank" which is MOCS table entry 0, which is uncached. Most data access has a more specific MOCS (e.g. in SURFACE_STATE), but scratch access uses the Stateless Data Port Access MOCS from STATE_BASE_ADDRESS. So this meant all scratch access was uncached. Improves performance in Synmark2's OglCSDof by 2x, bringing iris on par with the existing i965 driver. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
`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.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <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.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses email mailing-lists for patches submission, review and discussions.