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

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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.
This commit is contained in:
rustdesk
2026-08-27 14:49:34 +08:00
parent 81703e2a82
commit 62694cb43d
2 changed files with 4 additions and 4 deletions
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Cargo.lock
Generated
+2 -2
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@@ -9706,7 +9706,7 @@ dependencies = [
[[package]]
name = "webrtc-sctp"
version = "0.12.0"
source = "git+https://github.com/rustdesk-org/webrtc?rev=56d097c54f9ea1e48c0dfbeb6ce7e66d2e66e833#56d097c54f9ea1e48c0dfbeb6ce7e66d2e66e833"
source = "git+https://github.com/rustdesk-org/webrtc?rev=0a84ba37fbca940b82f230fb469d1b3a3172abf6#0a84ba37fbca940b82f230fb469d1b3a3172abf6"
dependencies = [
"arc-swap",
"async-trait",
@@ -9746,7 +9746,7 @@ dependencies = [
[[package]]
name = "webrtc-util"
version = "0.11.0"
source = "git+https://github.com/rustdesk-org/webrtc?rev=56d097c54f9ea1e48c0dfbeb6ce7e66d2e66e833#56d097c54f9ea1e48c0dfbeb6ce7e66d2e66e833"
source = "git+https://github.com/rustdesk-org/webrtc?rev=0a84ba37fbca940b82f230fb469d1b3a3172abf6#0a84ba37fbca940b82f230fb469d1b3a3172abf6"
dependencies = [
"async-trait",
"bitflags 1.3.2",
Cargo.toml
+2 -2
View File
@@ -222,8 +222,8 @@ libxdo-sys = { path = "libs/libxdo-sys-stub" }
# and fast retransmit cannot cover a request/response exchange; INITIAL_MTU 1228 also fragments on
# IPv6. The fork commit carries the arithmetic.
# Pinned by rev, not branch: a fork branch can be rewritten out from under the lockfile.
webrtc-util = { git = "https://github.com/rustdesk-org/webrtc", rev = "56d097c54f9ea1e48c0dfbeb6ce7e66d2e66e833" }
webrtc-sctp = { git = "https://github.com/rustdesk-org/webrtc", rev = "56d097c54f9ea1e48c0dfbeb6ce7e66d2e66e833" }
webrtc-util = { git = "https://github.com/rustdesk-org/webrtc", rev = "0a84ba37fbca940b82f230fb469d1b3a3172abf6" }
webrtc-sctp = { git = "https://github.com/rustdesk-org/webrtc", rev = "0a84ba37fbca940b82f230fb469d1b3a3172abf6" }
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