moonlight-stream/moonlight-common-c
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Fix extended delays for unreliable/unsequenced traffic on high latency connections

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This commit is contained in:
Cameron Gutman
2023-07-25 23:30:45 -05:00
parent 92cc6f96d4
commit 6d039a646b
1 changed files with 9 additions and 12 deletions
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19
src/ControlStream.c
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@@ -634,24 +634,16 @@ static bool sendMessageEnet(short ptype, short paylen, const void* payload, uint
// the peer's supported channel count.
if (!IS_SUNSHINE() || channelId >= peer->channelCount) {
channelId = 0;
// Send unreliable traffic as reliable if we only have one channel.
// This avoids unwanted sequencing between reliable and unreliable
// traffic that can lead to delays.
if (flags == 0) {
flags |= ENET_PACKET_FLAG_RELIABLE;
enetPacket->flags |= ENET_PACKET_FLAG_RELIABLE;
}
}
// Queue the packet to be sent
err = enet_peer_send(peer, channelId, enetPacket);
// Wait until the packet is actually sent to provide backpressure on senders
if (err == 0 && (flags & ENET_PACKET_FLAG_RELIABLE)) {
// Try to send the packet
enet_host_service(client, NULL, 0);
// Wait until the packet is actually sent to provide backpressure on senders
if (err == 0 && (flags & ENET_PACKET_FLAG_RELIABLE)) {
// Don't wait longer than 10 milliseconds to avoid blocking callers for too long
for (int i = 0; i < 10; i++) {
// Break on disconnected, acked/freed, or sent (pending ack).
@@ -1134,11 +1126,16 @@ static void lossStatsThreadFunc(void* context) {
}
// Send the message (and don't expect a response)
//
// NB: We send this periodic message as reliable to ensure the RTT is recomputed
// regularly. This only happens when an ACK is received to a reliable packet.
// Since the other traffic on this channel is unsequenced, it doesn't really
// cause any negative HOL blocking side-effects.
if (!sendMessageAndForget(0x0200,
sizeof(periodicPingPayload),
periodicPingPayload,
CTRL_CHANNEL_GENERIC,
0)) {
ENET_PACKET_FLAG_RELIABLE)) {
Limelog("Loss Stats: Transaction failed: %d\n", (int)LastSocketError());
ListenerCallbacks.connectionTerminated(LastSocketFail());
return;