smol world - #5424
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- fix free cwnd doubling in the initial/cwnd-10 round - fast convergence reduced wMax but computed fsK from the reduced wMax, so W_cubic(0) = 0.595*cwndAtLoss < the installed cut, and CA dragged cwnd DOWN on a clean round fix: fsK from (wMax - installed cwnd); provably a no-op outside the fast-conv corner, anchor-preserving - a warm flow now primes its CUBIC epoch (fsWMax, fsCubicOrigin) from ssthresh, mirroring the SS->CA clamp — else it regrew from origin 0 and was *slower* than cold. Must precede any D12 wiring - gate on max(tpRtoMinS, tpBaseRtoS) — the RTO the model charges is floored at tpRtoMinS, so the file no longer uses two values of "one RTO" - enter CA at w = max(ssthresh, cwnd) so a clean round never SHRINKS the window (the post-idleReset ssthresh<cwnd corner); no-op when cwnd<ssthresh - clear fsLastWMax (the fast-conv high-water mark) on RTO and idle-reset (Linux bictcp_reset); near-inert, for spec conformance - TCP.hs stepRound: the completing-fastRtx branch adds `rtt` to fsT (and counts a loss event) - Diffusion.hs: a `capFinal` guard extends the existing GE-RTO pre-loss-prefix `deliverB` cap to a recoverable loss that would complete the file, so it resumes ~1 RTT on. (Per-bin cap, NOT a boundary rollback — the boundary-gated version was refuted: completion is bin-gated, so a rollback fires only on the rare boundary-coincident bin and the drivers would disagree.)
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Description
a discrete-event simulator with realistic transport (loss + RTO) on a faithful small-world topology with per-node egress contention
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ouroboros-networkproject.