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This introduces a new option that makes autotune optimize for low preemption latency which is crucial to ensure responsiveness on systems with GPU-based composition. A large enough draw can entirely block the compositor from running with draw-level preemption, this can be mitigated by preferring to use GMEM which breaks up the draw into smaller pieces and generally has a lower latency for preemption. As a further mitigation, tiles in GMEM are then divided into smaller and smaller pieces which lowers the non-preemptible duration. There are static checks in place to avoid doing this when it would incur a cost that is too large. Uses performance counters read during ambles to detect preemption latency events while rendering in SYSMEM. This approach is superior to using RBBM draw time thresholds which could be imprecise as only the average was calculated rather than true maximum draw time. However, converting the preemption latency performance counter value from CP ticks to wall clock is based on the average GPU frequency of the whole period from the start of the RP until the switch-away amble while the preemption latency stars counting from the request. Thus, if the GPU frequency shifts rapidly throughout the RP, it may cause the estimated wall clock time to be inaccurate, but it should be good enough in the vast majority of cases. Signed-off-by: Dhruv Mark Collins <mark@igalia.com> Co-authored-by: Danylo Piliaiev <dpiliaiev@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37802> |
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| anv.rst | ||
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