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punktfunk/clients
enricobuehler a2433d77cf
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fix(core): reordering no longer reads as packet loss — net late shards out of the loss estimate
Reversed/reordered delivery lets a FEC block reconstruct EARLY
(data + recovery >= k), counting still-in-flight shards into
fec_recovered_shards; window_loss_ppm then reported pure reordering as
loss, inflating LossReports — which size adaptive FEC and, since the
Automatic overhaul, feed the ABR controller (one severe window ends slow
start FOR GOOD, so a reorder burst could permanently kneecap a session's
climb).

Early reconstruct stays (it's the latency-right choice); the accounting
now nets it out. The reassembler counts a new fec_late_shards stat when a
parity-restored data shard ARRIVES after all — matched exactly: the
completed/abandoned-frame memory (ReassemblyWindow::completed, now a map)
remembers which shards each terminal frame reconstructed, and a late
arrival must match one (removed on hit), so wire duplicates of delivered
shards and stragglers of failed blocks count nothing. In-flight blocks
dedup via have_data. window_loss_ppm takes the late delta and estimates
from (recovered - late), saturating across window boundaries; both
callers (client core + probe) pass it.

The e2e reorder tests now assert the NET equals the true kill count in
both delivery orders, dup included (previously documented as a known
inflation). Not mirrored into the C-ABI PunktfunkStats — the loss windows
run in-core on every platform.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-14 20:59:17 +02:00
..