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Adjust RTO logic to retransmit more quickly on links with high RTT variance

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Since Moonlight uses ENet for highly latency sensitive but very low bandwidth traffic flows, we'd rather generate a little excess traffic than wait too long to retransmit.
This commit is contained in:
Cameron Gutman
2023-07-30 13:52:25 -05:00
parent bbed828aae
commit 68ffba7d45
1 changed files with 6 additions and 4 deletions
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protocol.c
+6 -4
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@@ -1380,7 +1380,7 @@ enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * even
++ peer -> packetsLost;
roundTripTimeout = peer -> roundTripTime + 4 * ENET_MAX (1, peer -> roundTripTimeVariance);
roundTripTimeout = peer -> roundTripTime + ENET_MIN (peer -> roundTripTime, 4 * ENET_MAX (1, peer -> roundTripTimeVariance));
roundTripTimeout = ENET_MIN (roundTripTimeout, peer->timeoutMaximum / 5);
if (outgoingCommand -> sendAttempts < peer -> timeoutLimit)
outgoingCommand -> roundTripTimeout = roundTripTimeout * ENET_MAX (1, outgoingCommand -> sendAttempts);
@@ -1503,9 +1503,11 @@ enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer, ENetLis
}
++ outgoingCommand -> sendAttempts;
if (outgoingCommand -> roundTripTimeout == 0)
outgoingCommand -> roundTripTimeout = peer -> roundTripTime + 4 * ENET_MAX (1, peer -> roundTripTimeVariance);
if (outgoingCommand -> roundTripTimeout == 0) {
outgoingCommand -> roundTripTimeout = peer -> roundTripTime + ENET_MIN (peer -> roundTripTime, 4 * ENET_MAX (1, peer -> roundTripTimeVariance));
outgoingCommand -> roundTripTimeout = ENET_MIN (outgoingCommand -> roundTripTimeout, peer->timeoutMaximum / 5);
}
if (enet_list_empty (& peer -> sentReliableCommands))
peer -> nextTimeout = host -> serviceTime + outgoingCommand -> roundTripTimeout;