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punktfunk/crates
enricobuehler 5a384fe788
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feat(host): pace-aware send chunking — high-rate frames pace honestly instead of blasting
Phase 1.2: the native plane's pace chunks are rate-adaptive — 16 packets at
today's rates, coarsening until the per-chunk interval clears the 500 µs sleep
floor, capped at 64 (the GSO segment limit). Decouples the syscall batch from
the pace step, so a ≥1 Gbps frame's overflow keeps real sleeps between chunks
(and costs 4× fewer syscalls) instead of collapsing into an unpaced blast.

Phase 1.3: the auto microburst cap scales with the frame — max(128 KB, the
AU's wire bytes / 4) — so high-rate frames burst a bounded quarter and pace
the rest; PUNKTFUNK_PACE_BURST_KB now pins an absolute override.

GameStream plane untouched (its schedule stays pinned by the deterministic
tests, now also asserting budget-independence). Linux GSO latch-off warns
once (was silent; USO already warned).

Linux GSO default stays OPT-IN: the post-1.2/1.3 A/B on the 2.5GbE-hop pair
(.21 → M3 Ultra) reproduced the regression bit-for-bit — 2452 Mbps sendmmsg
vs 1909 GSO peak, 0.4% loss at 1500 where sendmmsg is clean. The super-buffer
trains lose on the constrained hop in the transport path itself (per-AU
probe sends, no video pacer involved), so the block is fabric evidence, not
pacing readiness. Control sweep on this build matched the sendmmsg baseline
exactly (2452); loss-harness recovery curve identical; workspace clippy +
tests green on .21.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-14 21:38:06 +02:00
..