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Macro DMA reads wait only for compute/copy writers (env-gated experiment) - #16
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…WRITER_WAIT=1) The GPU profile shows the front waiting for the back thread's whole queue on every macro memory read (about 600 per frame). With the env var set it waits only for the compute and copy work sent so far. Off by default. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RmvPX2tqfoEsDjDfWTAmSf
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The GPU profile shows the front GPU thread blocked on the back thread most of each second:
split drain~450 ms/s, with ~5,400–8,700 macro DMA reads per second (macro 0xe2c) each draining the whole queue.With
EDEN_NX2_DMA_WRITER_WAIT=1,FrontDmaReadcallsWaitForWriters(compute and copy work sent so far) instead ofDrain. Draws are not tracked as writers, so a draw that writes the macro's source memory would be missed. Off by default.Test: Kokiri idle with and without the variable; compare FPS and the
split drain/macro dma readnumbers fromEDEN_NX2_GPU_PROFILE=1.Generated by Claude Code