Cluster LOD 1c: streaming and residency -- page pool, page table, budgeted async uploads #746

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opened 2026-10-13 01:57:40 +00:00 by sky_line · 2 comments

sky_line commented

2026-10-13 01:57:40 +00:00

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Part of #642. Wave 1. Depends on the wave-0 contract.

Fixed VRAM page pool sized from the memory budget; always-resident root pages; LRU eviction; page table the selection reads.
Request readback without stalls; uploads on the async transfer queue under a per-frame byte budget, fence-gated residency.
Newest paths where available: GPU memory decompression of pages, indirect copies; plain staging copies as the floor.
Pressure behaviour per the soft-degrade rules; live / cap / peak stats.

Rules for this work (all sub-tickets):

Behind RenderVKClusterLOD (default off). With it off, the existing rigged LOD controller (#561 / #613) and every current path are untouched.
Newest path first, chosen by extension presence; every slower path is an additive fallback, forceable on the newest card via RenderVKClusterForceTier.
Failures never crash: a missing page / failed allocation falls back to the coarser parent cut; no unbounded growth (fixed pools, byte budgets, live/cap/peak stats).

Part of #642. **Wave 1.** Depends on the wave-0 contract. - Fixed VRAM page pool sized from the memory budget; always-resident root pages; LRU eviction; page table the selection reads. - Request readback without stalls; uploads on the async transfer queue under a per-frame byte budget, fence-gated residency. - Newest paths where available: GPU memory decompression of pages, indirect copies; plain staging copies as the floor. - Pressure behaviour per the soft-degrade rules; live / cap / peak stats. **Rules for this work (all sub-tickets):** - Behind `RenderVKClusterLOD` (default off). With it off, the existing rigged LOD controller (#561 / #613) and every current path are untouched. - Newest path first, chosen by extension presence; every slower path is an additive fallback, forceable on the newest card via `RenderVKClusterForceTier`. - Failures never crash: a missing page / failed allocation falls back to the coarser parent cut; no unbounded growth (fixed pools, byte budgets, live/cap/peak stats).

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