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Some work on congestion avoidance now uses a sliding congestion window instead of a static one

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This commit is contained in:
KimLS 2017-06-29 14:13:55 -07:00
parent d6ac686a54
commit 5c6f684808
2 changed files with 68 additions and 21 deletions
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76
common/net/daybreak_connection.cpp
View File

@ -283,6 +283,9 @@ EQ::Net::DaybreakConnection::DaybreakConnection(DaybreakConnectionManager *owner
m_combined[0] = 0;
m_combined[1] = OP_Combined;
m_last_session_stats = Clock::now();
m_outstanding_bytes = 0;
m_cwnd = m_max_packet_size;
m_ssthresh = m_owner->m_options.max_outstanding_bytes;
}
//new connection made as client
@ -306,6 +309,9 @@ EQ::Net::DaybreakConnection::DaybreakConnection(DaybreakConnectionManager *owner
m_combined[0] = 0;
m_combined[1] = OP_Combined;
m_last_session_stats = Clock::now();
m_outstanding_bytes = 0;
m_cwnd = m_max_packet_size;
m_ssthresh = m_owner->m_options.max_outstanding_bytes;
}
EQ::Net::DaybreakConnection::~DaybreakConnection()
@ -464,19 +470,15 @@ void EQ::Net::DaybreakConnection::ProcessOutboundQueue()
for (int i = 0; i < 4; ++i) {
auto stream = &m_streams[i];
if (stream->outstanding_bytes == 0) {
continue;
}
while (!stream->buffered_packets.empty()) {
auto &buff = stream->buffered_packets.front();
if (stream->outstanding_bytes + buff.sent.packet.Length() >= m_owner->m_options.max_outstanding_bytes ||
stream->outstanding_packets.size() + 1 >= m_owner->m_options.max_outstanding_packets) {
if (m_outstanding_bytes + buff.sent.packet.Length() >= m_cwnd) {
break;
}
stream->outstanding_bytes += buff.sent.packet.Length();
LogF(Logs::Detail, Logs::Netcode, "Sending buffered packet {0} on stream {1}", buff.seq, i);
m_outstanding_bytes += buff.sent.packet.Length();
stream->outstanding_packets.insert(std::make_pair(buff.seq, buff.sent));
InternalSend(buff.sent.packet);
stream->buffered_packets.pop_front();
@ -1051,7 +1053,10 @@ void EQ::Net::DaybreakConnection::ProcessResend(int stream)
InternalBufferedSend(entry.second.packet);
entry.second.last_sent = now;
entry.second.times_resent++;
m_rolling_ping += 100;
LogF(Logs::Detail, Logs::Netcode, "Congestion detected, reducing window size");
m_ssthresh = m_cwnd / 2;
m_cwnd = m_cwnd / 2;
}
}
else {
@ -1065,7 +1070,10 @@ void EQ::Net::DaybreakConnection::ProcessResend(int stream)
InternalBufferedSend(entry.second.packet);
entry.second.last_sent = now;
entry.second.times_resent++;
m_rolling_ping += 100;
LogF(Logs::Detail, Logs::Netcode, "Congestion detected, reducing window size");
m_ssthresh = m_cwnd / 2;
m_cwnd = m_cwnd / 2;
}
}
}
@ -1086,10 +1094,29 @@ void EQ::Net::DaybreakConnection::Ack(int stream, uint16_t seq)
m_stats.max_ping = std::max(m_stats.max_ping, round_time);
m_stats.min_ping = std::min(m_stats.min_ping, round_time);
m_stats.last_ping = round_time;
m_rolling_ping = (m_rolling_ping * 2 + round_time) / 3;
m_rolling_ping = (m_rolling_ping * 4 + round_time) / 5;
s->outstanding_bytes -= iter->second.packet.Length();
m_outstanding_bytes -= iter->second.packet.Length();
iter = s->outstanding_packets.erase(iter);
if (m_cwnd < m_ssthresh) {
//Still in slow start mode
m_cwnd *= 2;
if (m_cwnd > m_owner->m_options.max_outstanding_bytes) {
m_cwnd = m_owner->m_options.max_outstanding_bytes;
}
LogF(Logs::Detail, Logs::Netcode, "Increasing cwnd size new size is {0}", m_cwnd);
}
else {
m_cwnd += m_max_packet_size;
if (m_cwnd > m_owner->m_options.max_outstanding_bytes) {
m_cwnd = m_owner->m_options.max_outstanding_bytes;
}
LogF(Logs::Detail, Logs::Netcode, "Increasing cwnd size new size is {0}", m_cwnd);
}
ProcessOutboundQueue();
}
else {
@ -1111,8 +1138,28 @@ void EQ::Net::DaybreakConnection::OutOfOrderAck(int stream, uint16_t seq)
m_stats.last_ping = round_time;
m_rolling_ping = (m_rolling_ping * 2 + round_time) / 3;
s->outstanding_bytes -= iter->second.packet.Length();
m_outstanding_bytes -= iter->second.packet.Length();
s->outstanding_packets.erase(iter);
if (m_cwnd < m_ssthresh) {
//Still in slow start mode
m_cwnd *= 2;
if (m_cwnd > m_owner->m_options.max_outstanding_bytes) {
m_cwnd = m_owner->m_options.max_outstanding_bytes;
}
LogF(Logs::Detail, Logs::Netcode, "Increasing cwnd size new size is {0}", m_cwnd);
}
else {
m_cwnd += m_max_packet_size;
if (m_cwnd > m_owner->m_options.max_outstanding_bytes) {
m_cwnd = m_owner->m_options.max_outstanding_bytes;
}
LogF(Logs::Detail, Logs::Netcode, "Increasing cwnd size new size is {0}", m_cwnd);
}
ProcessOutboundQueue();
}
}
@ -1122,16 +1169,17 @@ void EQ::Net::DaybreakConnection::BufferPacket(int stream, uint16_t seq, Daybrea
auto s = &m_streams[stream];
//If we can send the packet then send it
//else buffer it to be sent when we can send it
if (s->outstanding_bytes + sent.packet.Length() >= m_owner->m_options.max_outstanding_bytes || s->outstanding_packets.size() + 1 >= m_owner->m_options.max_outstanding_packets) {
if (m_outstanding_bytes + sent.packet.Length() > m_cwnd) {
//Would go over one of the limits, buffer this packet.
DaybreakBufferedPacket bp;
bp.sent = std::move(sent);
bp.seq = seq;
s->buffered_packets.push_back(bp);
LogF(Logs::Detail, Logs::Netcode, "Buffering packet {0} on stream {1}", seq, stream);
return;
}
s->outstanding_bytes += sent.packet.Length();
m_outstanding_bytes += sent.packet.Length();
s->outstanding_packets.insert(std::make_pair(seq, sent));
InternalSend(sent.packet);
}

9
common/net/daybreak_connection.h
View File

@ -136,6 +136,9 @@ namespace EQ
size_t m_resend_delay;
size_t m_rolling_ping;
Timestamp m_close_time;
size_t m_outstanding_bytes;
size_t m_cwnd;
size_t m_ssthresh;
struct DaybreakSentPacket
{
@ -158,7 +161,6 @@ namespace EQ
sequence_out = 0;
fragment_current_bytes = 0;
fragment_total_bytes = 0;
outstanding_bytes = 0;
}
uint16_t sequence_in;
@ -171,7 +173,6 @@ namespace EQ
uint32_t fragment_total_bytes;
std::unordered_map<uint16_t, DaybreakSentPacket> outstanding_packets;
size_t outstanding_bytes;
};
DaybreakStream m_streams[4];
@ -236,8 +237,7 @@ namespace EQ
tic_rate_hertz = 60.0;
resend_timeout = 90000;
connection_close_time = 2000;
max_outstanding_packets = 300;
max_outstanding_bytes = 200 * 512;
max_outstanding_bytes = 65535;
}
size_t max_packet_size;
@ -260,7 +260,6 @@ namespace EQ
size_t connection_close_time;
DaybreakEncodeType encode_passes[2];
int port;
size_t max_outstanding_packets;
size_t max_outstanding_bytes;
};