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bump webrtc: probe on T3-rtx, settle the rest by the SACK, RTO from the latest send

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Sending without a congestion window, a T3-rtx resent everything in flight, and
on a 5 Mbps link with 300-500ms stalls that spiralled: seconds of latency and
several times the bytes. The fork now resends everything outstanding on a
timeout only when it packs into four packets; otherwise it resends one packet
and withholds the rest until the SACKs settle them (RFC 4960 6.3.3 E3, F-RTO):
an original acked takes the marks off, a first transmission made after the
timeout acked with the rest still missing sends them, and with nothing else to
tell, a probe acked no sooner than the least RTT after it went out draws the
next probe, two of them settling the rest as lost. A restarted RTO is counted
from the latest send as QUIC does, backs off from the full RTO, and floors at
KCP's 30ms with srtt + 25ms at the least. Lost tails of up to four packets and
sparse small messages under loss now recover at KCP's pace where they trailed
it by a frame; a stall no longer resends the backlog behind itself.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019aokqJuhjvB3kijXtAg5Ns
This commit is contained in:
rustdesk
2026-09-06 09:50:25 +08:00
parent dc04b911a1
commit 692113c87e
2 changed files with 8 additions and 5 deletions
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4
Cargo.lock generated
View File

@@ -9708,7 +9708,7 @@ dependencies = [
[[package]]
name = "webrtc-sctp"
version = "0.12.0"
source = "git+https://github.com/rustdesk-org/webrtc?rev=48100bf13e694d7e5bbb49b9a753dbad1c359d0c#48100bf13e694d7e5bbb49b9a753dbad1c359d0c"
source = "git+https://github.com/rustdesk-org/webrtc?rev=b221f13b1d6f21fbce09f9f63096be27dd392265#b221f13b1d6f21fbce09f9f63096be27dd392265"
dependencies = [
"arc-swap",
"async-trait",
@@ -9748,7 +9748,7 @@ dependencies = [
[[package]]
name = "webrtc-util"
version = "0.11.0"
source = "git+https://github.com/rustdesk-org/webrtc?rev=48100bf13e694d7e5bbb49b9a753dbad1c359d0c#48100bf13e694d7e5bbb49b9a753dbad1c359d0c"
source = "git+https://github.com/rustdesk-org/webrtc?rev=b221f13b1d6f21fbce09f9f63096be27dd392265#b221f13b1d6f21fbce09f9f63096be27dd392265"
dependencies = [
"async-trait",
"bitflags 1.3.2",

9
Cargo.toml
View File

@@ -224,10 +224,13 @@ libxdo-sys = { path = "libs/libxdo-sys-stub" }
# a congestion window, as KCP does - on by default, `allow-webrtc-congestion-control` opts back in.
# Sending that way, a reordering window keeps a chunk that is merely late from being resent on a
# path that jitters, every DATA chunk asks for its SACK at once so a lost tail is back within an
# RTT at KCP's RTO floors, and bundles of small chunks stay within the MTU.
# RTT at KCP's RTO floors, and bundles of small chunks stay within the MTU. A T3-rtx resends
# everything outstanding when it packs into four packets and otherwise probes with one and lets
# the SACK settle the rest (F-RTO), timed from the latest send, so a stall no longer resends the
# whole backlog behind itself while a short lost tail still comes back at once.
# 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 = "48100bf13e694d7e5bbb49b9a753dbad1c359d0c" }
webrtc-sctp = { git = "https://github.com/rustdesk-org/webrtc", rev = "48100bf13e694d7e5bbb49b9a753dbad1c359d0c" }
webrtc-util = { git = "https://github.com/rustdesk-org/webrtc", rev = "b221f13b1d6f21fbce09f9f63096be27dd392265" }
webrtc-sctp = { git = "https://github.com/rustdesk-org/webrtc", rev = "b221f13b1d6f21fbce09f9f63096be27dd392265" }
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