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Merge pull request #2043 from Vort/rtt_tune

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tune RTT calculations
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orignal 2024-03-15 14:50:56 -04:00 committed by GitHub
parent 5412e29ff5 d74033dd2b
commit 0c5dee69ba
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GPG key ID: B5690EEEBB952194
4 changed files with 15 additions and 8 deletions
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7
libi2pd/SSU2Session.cpp
View file

@ -85,7 +85,7 @@ namespace transport
m_DestConnID (0), m_SourceConnID (0), m_State (eSSU2SessionStateUnknown),
m_SendPacketNum (0), m_ReceivePacketNum (0), m_LastDatetimeSentPacketNum (0),
m_IsDataReceived (false), m_WindowSize (SSU2_MIN_WINDOW_SIZE),
m_RTT (SSU2_RESEND_INTERVAL), m_RTO (SSU2_RESEND_INTERVAL*SSU2_kAPPA), m_RelayTag (0),
m_RTT (SSU2_UNKNOWN_RTT), m_RTO (SSU2_INITIAL_RTO), m_RelayTag (0),
m_ConnectTimer (server.GetService ()), m_TerminationReason (eSSU2TerminationReasonNormalClose),
m_MaxPayloadSize (SSU2_MIN_PACKET_SIZE - IPV6_HEADER_SIZE - UDP_HEADER_SIZE - 32) // min size
{
@ -1753,7 +1753,10 @@ namespace transport
if (ts > it1->second->sendTime)
{
auto rtt = ts - it1->second->sendTime;
m_RTT = std::round ((m_RTT*m_SendPacketNum + rtt)/(m_SendPacketNum + 1.0));
if (m_RTT != SSU2_UNKNOWN_RTT)
m_RTT = SSU2_RTT_EWMA_ALPHA * rtt + (1.0 - SSU2_RTT_EWMA_ALPHA) * m_RTT;
else
m_RTT = rtt;
m_RTO = m_RTT*SSU2_kAPPA;
if (m_RTO < SSU2_MIN_RTO) m_RTO = SSU2_MIN_RTO;
if (m_RTO > SSU2_MAX_RTO) m_RTO = SSU2_MAX_RTO;

7
libi2pd/SSU2Session.h
View file

@ -36,7 +36,6 @@ namespace transport
const size_t SSU2_MAX_PACKET_SIZE = 1500;
const size_t SSU2_MIN_PACKET_SIZE = 1280;
const int SSU2_HANDSHAKE_RESEND_INTERVAL = 1000; // in milliseconds
const int SSU2_RESEND_INTERVAL = 300; // in milliseconds
const int SSU2_MAX_NUM_RESENDS = 5;
const int SSU2_INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT = 30; // in seconds
const int SSU2_MAX_NUM_RECEIVED_I2NP_MSGIDS = 5000; // how many msgID we store for duplicates check
@ -45,7 +44,10 @@ namespace transport
const size_t SSU2_MIN_WINDOW_SIZE = 16; // in packets
const size_t SSU2_MAX_WINDOW_SIZE = 256; // in packets
const size_t SSU2_MIN_RTO = 100; // in milliseconds
const size_t SSU2_INITIAL_RTO = 540; // in milliseconds
const size_t SSU2_MAX_RTO = 2500; // in milliseconds
const double SSU2_UNKNOWN_RTT = -1;
const double SSU2_RTT_EWMA_ALPHA = 0.125;
const float SSU2_kAPPA = 1.8;
const int SSU2_MAX_NUM_ACNT = 255; // acnt, acks or nacks
const int SSU2_MAX_NUM_ACK_PACKETS = 511; // ackthrough + acnt + 1 range
@ -356,7 +358,8 @@ namespace transport
std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
i2p::I2NPMessagesHandler m_Handler;
bool m_IsDataReceived;
size_t m_WindowSize, m_RTT, m_RTO;
double m_RTT;
size_t m_WindowSize, m_RTO;
uint32_t m_RelayTag; // between Bob and Charlie
OnEstablished m_OnEstablished; // callback from Established
boost::asio::deadline_timer m_ConnectTimer;

4
libi2pd/Streaming.cpp
View file

@ -434,7 +434,7 @@ namespace stream
rtt = 1;
}
if (seqn)
m_RTT = std::round (RTT_EWMA_ALPHA * m_RTT + (1.0 - RTT_EWMA_ALPHA) * rtt);
m_RTT = RTT_EWMA_ALPHA * rtt + (1.0 - RTT_EWMA_ALPHA) * m_RTT;
else
m_RTT = rtt;
m_RTO = m_RTT*1.5; // TODO: implement it better
@ -457,7 +457,7 @@ namespace stream
if (!seqn && m_RoutingSession) // first message confirmed
m_RoutingSession->SetSharedRoutingPath (
std::make_shared<i2p::garlic::GarlicRoutingPath> (
i2p::garlic::GarlicRoutingPath{m_CurrentOutboundTunnel, m_CurrentRemoteLease, m_RTT, 0, 0}));
i2p::garlic::GarlicRoutingPath{m_CurrentOutboundTunnel, m_CurrentRemoteLease, (int)m_RTT, 0, 0}));
}
else
break;

5
libi2pd/Streaming.h
View file

@ -57,7 +57,7 @@ namespace stream
const int MIN_WINDOW_SIZE = 1;
const int MAX_WINDOW_SIZE = 128;
const int WINDOW_SIZE_DROP_FRACTION = 10; // 1/10
const double RTT_EWMA_ALPHA = 0.5;
const double RTT_EWMA_ALPHA = 0.125;
const int INITIAL_RTT = 8000; // in milliseconds
const int INITIAL_RTO = 9000; // in milliseconds
const int MIN_SEND_ACK_TIMEOUT = 2; // in milliseconds
@ -254,7 +254,8 @@ namespace stream
uint16_t m_Port;
SendBufferQueue m_SendBuffer;
int m_WindowSize, m_RTT, m_RTO, m_AckDelay;
double m_RTT;
int m_WindowSize, m_RTO, m_AckDelay;
uint64_t m_LastWindowSizeIncreaseTime;
int m_NumResendAttempts;
size_t m_MTU;