docs(stats): clarify server receive-window semantics #72

2026-08-11T14:36:12Z

Lochnair commented

2026-08-11 14:36:12 +00:00

(Migrated from github.com)

An audit of the server-reported receive window found no defect in the statistics pipeline: the bitmap is decoded raw, stored raw, never interpreted, and never feeds the directional loss estimates, which use the cumulative server receive count.

The public rustdoc was silent on all of that, leaving consumers of PacketCounts free to read a window of 0x1 as a 63-packet loss burst. Document the field's contract, name the count as the only server input to LossStats, and cover the window-only case with a regression test.

An audit of the server-reported receive window found no defect in the statistics pipeline: the bitmap is decoded raw, stored raw, never interpreted, and never feeds the directional loss estimates, which use the cumulative server receive count. The public rustdoc was silent on all of that, leaving consumers of PacketCounts free to read a window of 0x1 as a 63-packet loss burst. Document the field's contract, name the count as the only server input to LossStats, and cover the window-only case with a regression test.

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Reference: Lochnair-Labs/irtt-rs#72