- REPLAY_WINDOW 32768 -> 131072: the anti-replay bitmap covered the
120 ms loss window only to ~2 Gbps; the client now delivers ~4.8 Gbps
wire, where a late-but-valid Wi-Fi-retried datagram would have been
dropped as 'older than the window' — false loss. 16 KiB/session
covers ~12 Gbps.
- RECV_BATCH 32 -> 128: syscall rate stays ~3.4k/s at 430k pkt/s and
each pump iteration drains the kernel buffer deeper (ring 64->256 KB,
client sessions only). flush_backlog's iteration cap rescaled to keep
its ~190 MB guard equivalent.
- PUNKTFUNK_GSO gate is now value-aware: '=0' used to ENABLE GSO on
Linux (presence check) while disabling Windows USO. GSO stays OPT-IN,
deliberately: A/B'd twice today — it cuts send-thread CPU ~30% but
its 16-packet line-rate trains cost delivered throughput on a
constrained fabric (2.5GbE-hop pair: peak 2453 -> 1908 Mbps and 0.4%
loss at a rate sendmmsg carries clean). Flipping the default belongs
with pace-aware chunk spacing (plan Phase 1.2/1.3). docs-site row
corrected to match.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
1a559e8d5e