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If we detect that a scheduling candidate will stall because having a register source that is the written by the SFU unit in the previous instruction we reduce its priority so any non stalling operation would be chosen. The latency of SFU operations is defined as 2. So they would be scheduled earlier if other candidates have the same priority. Finally we won't merge instructions that stall to a previously chosen one. As the result of the previous one would be waiting for an extra cycle. Although shader-db result show that instruction are hurt with an increase of 0.35% the sum of instructions + stalls is reduced a 0.52%. And the total of sfu-stalls is reduced a 63.51%. It implies also a small increase in the max-temps metric because of scheduling earlier SFU operations. total instructions in shared programs: 9102719 -> 9117851 (0.17%) instructions in affected programs: 4324628 -> 4339760 (0.35%) helped: 4162 HURT: 12128 helped stats (abs) min: 1 max: 10 x̄: 1.28 x̃: 1 helped stats (rel) min: 0.09% max: 4.76% x̄: 0.66% x̃: 0.51% HURT stats (abs) min: 1 max: 27 x̄: 1.69 x̃: 1 HURT stats (rel) min: 0.05% max: 7.69% x̄: 0.87% x̃: 0.68% 95% mean confidence interval for instructions value: 0.90 0.96 95% mean confidence interval for instructions %-change: 0.47% 0.50% Instructions are HURT. total max-temps in shared programs: 1327728 -> 1327812 (<.01%) max-temps in affected programs: 4730 -> 4814 (1.78%) helped: 61 HURT: 134 helped stats (abs) min: 1 max: 2 x̄: 1.08 x̃: 1 helped stats (rel) min: 2.70% max: 13.33% x̄: 4.89% x̃: 4.17% HURT stats (abs) min: 1 max: 3 x̄: 1.12 x̃: 1 HURT stats (rel) min: 1.54% max: 20.00% x̄: 6.10% x̃: 5.26% 95% mean confidence interval for max-temps value: 0.28 0.58 95% mean confidence interval for max-temps %-change: 1.80% 3.52% Max-temps are HURT. total sfu-stalls in shared programs: 99551 -> 36324 (-63.51%) sfu-stalls in affected programs: 95029 -> 31802 (-66.53%) helped: 25882 HURT: 0 helped stats (abs) min: 1 max: 27 x̄: 2.44 x̃: 2 helped stats (rel) min: 5.26% max: 100.00% x̄: 79.86% x̃: 100.00% 95% mean confidence interval for sfu-stalls value: -2.47 -2.42 95% mean confidence interval for sfu-stalls %-change: -80.18% -79.54% Sfu-stalls are helped. total inst-and-stalls in shared programs: 9202270 -> 9154175 (-0.52%) inst-and-stalls in affected programs: 5618516 -> 5570421 (-0.86%) helped: 22728 HURT: 855 helped stats (abs) min: 1 max: 31 x̄: 2.16 x̃: 1 helped stats (rel) min: 0.07% max: 16.67% x̄: 1.14% x̃: 0.92% HURT stats (abs) min: 1 max: 5 x̄: 1.25 x̃: 1 HURT stats (rel) min: 0.12% max: 5.26% x̄: 1.24% x̃: 0.86% 95% mean confidence interval for inst-and-stalls value: -2.07 -2.01 95% mean confidence interval for inst-and-stalls %-change: -1.07% -1.05% Inst-and-stalls are helped. v2: Rename v3d_qpu_generates_sfu_stalls to v3d_qpu_instr_is_sfu (Eric) Reviewed-by: Eric Anholt <eric@anholt.net> |
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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.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.