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punktfunk/crates
enricobuehler 8e75f3d8bf
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perf(latency): adaptive IDD pipeline depth — depth-1 default, escalate on contention
From the 2026-07-17 on-glass finding (.173 RTX 4090): the IDD-push capturer's
depth-2 pipeline measured ~13ms of glass-to-glass latency over depth-1 at
60fps (17ms → 4ms) — the AU is ready in µs but depth-2 holds it a whole frame
interval unpolled while N+1 is submitted. Depth-2 only earns its keep under
GPU contention (it overlaps the convert of N+1 with the encode of N, avoiding
the depth-1 ~50fps collapse). So the native encode loop now runs depth-1 by
default and escalates to the capturer's max ONLY when it can't hold cadence at
depth-1 (a leaky-bucket over 'the frame's work overran its pacing deadline',
with a startup warmup skip), then holds there for the session (no oscillation;
de-escalation is a v2 item). PUNKTFUNK_IDD_ADAPTIVE=0 pins the capturer's full
depth (pre-adaptive behaviour); no effect where the capturer's max is already
1 (every non-IDD backend). GameStream plane untouched.

Pairs with the shipped REALTIME auto-gate (1bc156aa): uncontended sessions get
the ~13ms latency cut, genuinely GPU-bound ones keep the depth-2 overlap AND
the REALTIME priority. Validated: .21 clippy -D warnings (host --features nvenc).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-17 20:48:55 +02:00
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