rustdesk c78de1c1e7 webrtc: correct the RTT variance floor to dcsctp's scaling ...

The earlier commit took dcsctp's min_rtt_variance = 220 as a raw floor under
rttvar. dcsctp divides the option by kHeuristicVarianceAdjustment = 8.0 first,
a historical accident it kept because downstream users had measured good
values with it, so the intended floor is 27.5ms of variance contributing 110ms
to RTO. Flooring at 220 contributed 880ms instead, which on a 50ms path left
RTO within 7% of the 1000ms default this change exists to escape.

The fork also now records why T1/T2 share T3's RTO manager here, unlike
dcsctp's separate control timers: RTO_INITIAL is the T3 value for the first
DATA chunk, since no RTT sample exists before the first SACK.

2026-09-03 17:13:16 +08:00

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