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Code Issues Releases Activity

extract single RTT sample from stream ACK

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Vort 2024-03-19 08:28:34 +02:00
parent cf77be0eeb
commit 83f0b9c041
1 changed files with 29 additions and 21 deletions
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50
libi2pd/Streaming.cpp
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@ -404,6 +404,8 @@ namespace stream
LogPrint (eLogError, "Streaming: Unexpected ackThrough=", ackThrough, " > seqn=", m_SequenceNumber);
return;
}
int rttSample = INT_MAX;
bool firstRttSample = false;
int nackCount = packet->GetNACKCount ();
for (auto it = m_SentPackets.begin (); it != m_SentPackets.end ();)
{
@ -430,39 +432,45 @@ namespace stream
int64_t rtt = (int64_t)ts - (int64_t)sentPacket->sendTime;
if (rtt < 0)
LogPrint (eLogError, "Streaming: Packet ", seqn, "sent from the future, sendTime=", sentPacket->sendTime);
bool rttUpdated = true;
if (!seqn)
m_RTT = rtt < 0 ? 1 : rtt;
{
firstRttSample = true;
rttSample = rtt < 0 ? 1 : rtt;
}
else if (!sentPacket->resent && rtt >= 0)
m_RTT = RTT_EWMA_ALPHA * rtt + (1.0 - RTT_EWMA_ALPHA) * m_RTT;
else
rttUpdated = false;
if (rttUpdated)
m_RTO = std::max (MIN_RTO, (int)(m_RTT * 1.5)); // TODO: implement it better
rttSample = std::min (rttSample, (int)rtt);
LogPrint (eLogDebug, "Streaming: Packet ", seqn, " acknowledged rtt=", rtt, " sentTime=", sentPacket->sendTime);
m_SentPackets.erase (it++);
m_LocalDestination.DeletePacket (sentPacket);
acknowledged = true;
if (m_WindowSize < WINDOW_SIZE)
m_WindowSize++; // slow start
else
{
// linear growth
if (ts > m_LastWindowSizeIncreaseTime + m_RTT)
{
m_WindowSize++;
if (m_WindowSize > MAX_WINDOW_SIZE) m_WindowSize = MAX_WINDOW_SIZE;
m_LastWindowSizeIncreaseTime = ts;
}
}
if (!seqn && m_RoutingSession) // first message confirmed
m_RoutingSession->SetSharedRoutingPath (
std::make_shared<i2p::garlic::GarlicRoutingPath> (
i2p::garlic::GarlicRoutingPath{m_CurrentOutboundTunnel, m_CurrentRemoteLease, (int)m_RTT, 0, 0}));
}
else
break;
}
if (rttSample != INT_MAX)
{
if (firstRttSample)
m_RTT = rttSample;
else
m_RTT = RTT_EWMA_ALPHA * rttSample + (1.0 - RTT_EWMA_ALPHA) * m_RTT;
m_RTO = std::max (MIN_RTO, (int)(m_RTT * 1.5)); // TODO: implement it better
}
if (acknowledged && m_WindowSize >= WINDOW_SIZE)
{
// linear growth
if (ts > m_LastWindowSizeIncreaseTime + m_RTT)
{
m_WindowSize++;
if (m_WindowSize > MAX_WINDOW_SIZE) m_WindowSize = MAX_WINDOW_SIZE;
m_LastWindowSizeIncreaseTime = ts;
}
}
if (firstRttSample && m_RoutingSession)
m_RoutingSession->SetSharedRoutingPath (
std::make_shared<i2p::garlic::GarlicRoutingPath> (
i2p::garlic::GarlicRoutingPath{m_CurrentOutboundTunnel, m_CurrentRemoteLease, (int)m_RTT, 0, 0}));
if (m_SentPackets.empty ())
m_ResendTimer.cancel ();
if (acknowledged)