Mirrors/i2pd
2
0
Fork 0
mirror of https://github.com/PurpleI2P/i2pd.git synced 2025-01-22 21:37:17 +01:00
Code Issues Actions 6 Packages Projects Releases Wiki Activity

slow start and congestion avoidance

Browse source
This commit is contained in:
orignal 2015-01-29 15:34:43 -05:00
parent 974a7ff3f5
commit 5887e8c8c4
2 changed files with 29 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
Streaming.cpp
View file

@ -17,7 +17,8 @@ namespace stream
m_IsReset (false), m_IsAckSendScheduled (false), m_LocalDestination (local),
m_RemoteLeaseSet (remote), m_ReceiveTimer (m_Service),
m_ResendTimer (m_Service), m_AckSendTimer (m_Service),
m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (port)
m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (port),
m_WindowSize (MIN_WINDOW_SIZE), m_LastWindowSizeIncreaseTime (0)
{
m_RecvStreamID = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
UpdateCurrentRemoteLease ();
@ -27,7 +28,8 @@ namespace stream
m_Service (service), m_SendStreamID (0), m_SequenceNumber (0), m_LastReceivedSequenceNumber (-1),
m_IsOpen (false), m_IsReset (false), m_IsAckSendScheduled (false), m_LocalDestination (local),
m_ReceiveTimer (m_Service), m_ResendTimer (m_Service), m_AckSendTimer (m_Service),
m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (0)
m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (0),
m_WindowSize (MIN_WINDOW_SIZE), m_LastWindowSizeIncreaseTime (0)
{
m_RecvStreamID = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
}
@ -239,10 +241,29 @@ namespace stream
m_SentPackets.erase (it++);
delete sentPacket;
acknowledged = true;
if (m_WindowSize < WINDOW_SIZE)
m_WindowSize++; // slow start
else
{
// linear growth
auto ts = i2p::util::GetMillisecondsSinceEpoch ();
if (ts > m_LastWindowSizeIncreaseTime + INITIAL_RTT)
{
m_WindowSize++;
if (m_WindowSize > MAX_WINDOW_SIZE) m_WindowSize = MAX_WINDOW_SIZE;
m_LastWindowSizeIncreaseTime = ts;
}
}
}
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)
@ -263,7 +284,7 @@ namespace stream
void Stream::SendBuffer ()
{
int numMsgs = WINDOW_SIZE - m_SentPackets.size ();
int numMsgs = m_WindowSize - m_SentPackets.size ();
if (numMsgs <= 0) return; // window is full
bool isNoAck = m_LastReceivedSequenceNumber < 0; // first packet

5
Streaming.h
View file

@ -45,6 +45,9 @@ namespace stream
const int ACK_SEND_TIMEOUT = 200; // in milliseconds
const int MAX_NUM_RESEND_ATTEMPTS = 5;
const int WINDOW_SIZE = 6; // in messages
const int MIN_WINDOW_SIZE = 1;
const int MAX_WINDOW_SIZE = 128;
const int INITIAL_RTT = 8000; // in milliseconds
struct Packet
{
@ -157,6 +160,8 @@ namespace stream
std::mutex m_SendBufferMutex;
std::stringstream m_SendBuffer;
int m_WindowSize;
uint64_t m_LastWindowSizeIncreaseTime;
};
class StreamingDestination