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This decreases the time spent in amdgpu_cs_submit_ib from 15.4% to 8.3% in VP2020/Catia1, which is a decrease of CPU load for that thread by 46%. Overall, it increases performance by a small number in CPU-bound benchmarks. The biggest improvement I have seen is VP2020/Catia2, where it increases FPS by 12%. It no longer stores pipe_fence_handle references inside amdgpu_winsys_bo. The idea is to have a global fixed list of queues (only 1 queue per IP for now) where each queue generates its own sequence numbers (generated by the winsys, not the kernel). Each queue also has a ring of fences. The sequence numbers are used as indices into the ring of fences, which is how sequence numbers are converted to fences. With that, each BO only has to keep a list of sequence numbers, 1 for each queue. The maximum number of queues is set to 6. Since the system can handle integer wraparounds of sequence numbers correctly, we only need 16-bit sequence numbers in BOs to have accurate busyness tracking. Thus, each BO uses only 12 bytes to represent all its fences for all queues. There is also a 1-byte bitmask saying which sequence numbers are initialized. amdgpu_winsys.h contains the complete description. It has several limitations that exist to minimize the memory footprint and updating of BO fences. Acked-by: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@amd.com> Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26643> |
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