Stage B of the zero-copy host packetize path (networking-audit deferred
plan §1): Packetizer::packetize_each yields (header, shard) pairs in exact
wire order; Session::seal_frame writes seq(8) ‖ header(40) ‖ shard ‖ tag
scratch directly into the pooled wire buffer and seals [8..] in place. The
per-packet intermediate Vec (header ++ body) and its extra memcpy are gone
— with Stage A, every data byte is now copied once (frame → wire) instead
of three times, and the ~2 transient allocs/packet on the send thread are
zero after pool warmup (~180k allocs/s at 1 Gbps rates).
packetize() stays as a thin wrapper over packetize_each — the reference
implementation used by tests and the loss harness.
- wire-equivalence test: pooled path vs wrapper path byte-identical across
multi-block/partial-tail/exact-multiple/empty frames, fec 0%/50%, both
schemes, crypto on/off
- loss-harness sweep: recovery rates identical to the pre-item-1 baseline
- bench pipeline (end-to-end incl. client half) vs pre-item-1 baseline,
stages A+B cumulative: gf16/64K -3.6%, gf16/1M -3.2%; gf8 cases are
Cauchy-math-bound and unchanged within noise
- cargo ndk check (arm64-v8a) green
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
68a863866a