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punktfunk/crates
enricobuehlerandClaude Fable 5 f4f6c5556f perf(core): FEC encoder reuse — cached codecs + pooled parity, no per-block setup
Phase 1.4 (throughput-beyond-1gbps.md): the send path built a fresh erasure
codec and allocated fresh parity Vecs for every FEC block. New trait method
ErasureCoder::encode_into generates parity into caller-pooled buffers; the
packetizer keeps one parity pool that grows once to the session's high-water
recovery count.

- gf16: one cached reed_solomon_simd::ReedSolomonEncoder per coder, re-shaped
  per block via reset() (reuses its working space) — the old encode()
  convenience call paid engine CPU-feature detection, FFT planning, and
  work-buffer allocation per block.
- gf8: last-used (k, m) Cauchy codec cached, so the generator-matrix build
  drops out of steady-state frames; parity buffers shaped without re-zeroing
  (encode_sep's first-input pass overwrites every row). The GameStream
  VideoPacketizer now owns a persistent coder so the cache survives frames.
- encode() delegates to encode_into — one code path, and the nanors byte-exact
  parity vector keeps pinning Moonlight wire compatibility.

Validated: 145 core + 308 host tests + clippy -D warnings on .21, loss-harness
recovery curve identical, pipeline bench +0.6-2.4% thrpt (all configs, p<0.05;
the loopback bench is encoder-dominated so the alloc savings mostly land
outside it).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-14 23:19:21 +02:00
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