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congesion control during retransmission

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orignal 2015-01-29 19:17:44 -05:00
parent 5887e8c8c4
commit aae837f642
1 changed files with 16 additions and 11 deletions
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27
Streaming.cpp
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@ -114,10 +114,8 @@ namespace stream
{
if (receivedSeqn <= m_LastReceivedSequenceNumber)
{
// we have received duplicate. Most likely our outbound tunnel is dead
// we have received duplicate
LogPrint (eLogWarning, "Duplicate message ", receivedSeqn, " received");
m_CurrentOutboundTunnel = nullptr; // pick another outbound tunnel
UpdateCurrentRemoteLease (); // pick another lease
SendQuickAck (); // resend ack for previous message again
delete packet; // packet dropped
}
@ -258,12 +256,6 @@ namespace stream
else
break;
}
if (nackCount > 0)
{
// congesion avoidance
m_WindowSize -= nackCount;
if (m_WindowSize < MIN_WINDOW_SIZE) m_WindowSize = MIN_WINDOW_SIZE;
}
if (m_SentPackets.empty ())
m_ResendTimer.cancel ();
if (acknowledged)
@ -568,10 +560,13 @@ namespace stream
{
if (ecode != boost::asio::error::operation_aborted)
{
bool congesion = false;
std::vector<Packet *> packets;
for (auto it : m_SentPackets)
{
it->numResendAttempts++;
if (it->numResendAttempts == 1) // detect congesion at first attempt only
congesion = true;
if (it->numResendAttempts <= MAX_NUM_RESEND_ATTEMPTS)
packets.push_back (it);
else
@ -585,8 +580,18 @@ namespace stream
}
if (packets.size () > 0)
{
m_CurrentOutboundTunnel = nullptr; // pick another outbound tunnel
UpdateCurrentRemoteLease (); // pick another lease
if (congesion)
{
// congesion avoidance
m_WindowSize /= 2;
if (m_WindowSize < MIN_WINDOW_SIZE) m_WindowSize = MIN_WINDOW_SIZE;
}
else
{
// congesion avoidance didn't help
m_CurrentOutboundTunnel = nullptr; // pick another outbound tunnel
UpdateCurrentRemoteLease (); // pick another lease
}
SendPackets (packets);
}
ScheduleResend ();