enricobuehler
1bc156aab0
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design/latency-reduction-2026-07.md tier 2, the two code-side halves: - T2.2: the Linux direct-NVENC backend gains the two-thread retrieve (PUNKTFUNK_NVENC_ASYNC, the same opt-in knob as Windows): the session stays sync-mode (async events are Windows-only) but the blocking lock_bitstream moves to a dedicated pf-nvenc-out thread — the NVENC guide's sanctioned submit-thread/output-thread split. poll() drains completions non-blocking, submit() backpressures at PUNKTFUNK_NVENC_ASYNC_DEPTH (default 4) in-flight; map/unmap and every other session call stay on the encode thread; teardown joins the thread before destroying the session. Under a GPU-saturating game completed frames queue instead of serializing capture on the encode wait. - T2.3: PUNKTFUNK_GPU_PRIORITY_CLASS gains 'auto' AND IT IS THE NEW DEFAULT (gpu-contention §5.C): HIGH immediately, then REALTIME where the documented NVIDIA+HAGS+near-full-VRAM NVENC hang cannot bite — HAGS probed once via D3DKMT WDDM_2_7_CAPS (off => REALTIME outright); HAGS on => a pf-gpu-prio monitor flips REALTIME<->HIGH on LOCAL-segment VRAM headroom (downgrade >92% of budget, restore <=85% for 3x2s polls). 'high' restores the old static default; 'realtime' pins it (operator owns the hazard). Validated: .21 clippy -D warnings (punktfunk-host --features nvenc) against the QSV-merged main; .133 Windows cargo check of pf-frame + punktfunk-host. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>