INET Framework for OMNeT++/OMNEST
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#include <TCPBaseAlg_old.h>
Public Member Functions | |
TCPBaseAlgStateVariables () | |
virtual std::string | info () const |
virtual std::string | detailedInfo () const |
Public Attributes | |
bool | delayed_acks_enabled |
TCP features. | |
bool | nagle_enabled |
Nagle's algorithm (off = NODELAY socket option) | |
int | rexmit_count |
retransmit count | |
simtime_t | rexmit_timeout |
current retransmission timeout (aka RTO) | |
uint | snd_cwnd |
uint32 | rtseq |
round-trip time measurements | |
simtime_t | rtseq_sendtime |
time when rtseq was sent (0 if RTT measurement is not running) | |
simtime_t | srtt |
round-trip time estimation (Jacobson's algorithm) | |
simtime_t | rttvar |
variance of round-trip time |
State variables for TCPBaseAlg.
TCPBaseAlgStateVariables::TCPBaseAlgStateVariables | ( | ) |
{ // We disable delayed acks, since it appears that it isn't used in real-life TCPs. // // In SSFNet test suite http://www.ssfnet.org/Exchange/tcp/test/f5.html // the rule for delayed ACK is: // An ACK must be sent immediatly when either of the following conditions exist: // * Two full-sized packets received (to avoid too few ACKs). // * Out of order packets received (to help trigger fast retransmission). // * Received packet fills in all gap or part of gap of out of order data. // We do not implement this rule. In our measurements on network traffic, we // never encountered delayed ACKs. // delayed_acks_enabled = false; nagle_enabled = true; // FIXME this should be parameter eventually rexmit_count = 0; rexmit_timeout = 3.0; snd_cwnd = 0; // will be set to MSS when connection is established rtseq = 0; rtseq_sendtime = 0; // Jacobson's alg: srtt must be initialized to 0, rttvar to a value which // will yield rto = 3s initially. srtt = 0; rttvar = 3.0/4.0; }
std::string TCPBaseAlgStateVariables::detailedInfo | ( | void | ) | const [virtual] |
Reimplemented from tcp_old::TCPStateVariables.
Reimplemented in tcp_old::TCPTahoeRenoFamilyStateVariables.
{ std::stringstream out; out << TCPStateVariables::detailedInfo(); out << "snd_cwnd = " << snd_cwnd << "\n"; out << "rto = " << rexmit_timeout << "\n"; // TBD add others too return out.str(); }
std::string TCPBaseAlgStateVariables::info | ( | ) | const [virtual] |
Reimplemented from tcp_old::TCPStateVariables.
Reimplemented in tcp_old::TCPTahoeRenoFamilyStateVariables.
{ std::stringstream out; out << TCPStateVariables::info(); out << " snd_cwnd=" << snd_cwnd; out << " rto=" << rexmit_timeout; return out.str(); }
TCP features.
delayed ACKs enabled/disabled; FIXME make this a socket option
Referenced by tcp_old::TCPBaseAlg::receiveSeqChanged(), and TCPBaseAlgStateVariables().
Nagle's algorithm (off = NODELAY socket option)
Referenced by tcp_old::TCPBaseAlg::sendData(), and TCPBaseAlgStateVariables().
retransmit count
number of retransmissions (=1 after first rexmit)
Referenced by tcp_old::TCPBaseAlg::processRexmitTimer(), tcp_old::TCPBaseAlg::startRexmitTimer(), and TCPBaseAlgStateVariables().
current retransmission timeout (aka RTO)
Referenced by detailedInfo(), info(), tcp_old::TCPBaseAlg::processRexmitTimer(), tcp_old::TCPBaseAlg::rttMeasurementComplete(), tcp_old::TCPBaseAlg::startRexmitTimer(), and TCPBaseAlgStateVariables().
round-trip time measurements
starting sequence number of timed data
Referenced by tcp_old::TCPBaseAlg::dataSent(), tcp_old::TCPBaseAlg::receivedDataAck(), and TCPBaseAlgStateVariables().
time when rtseq was sent (0 if RTT measurement is not running)
Referenced by tcp_old::TCPBaseAlg::dataSent(), tcp_old::TCPBaseAlg::processRexmitTimer(), tcp_old::TCPBaseAlg::receivedDataAck(), and TCPBaseAlgStateVariables().
variance of round-trip time
Referenced by tcp_old::TCPBaseAlg::rttMeasurementComplete(), and TCPBaseAlgStateVariables().
congestion window
Referenced by detailedInfo(), tcp_old::TCPBaseAlg::established(), info(), tcp_old::TCPNoCongestionControl::initialize(), tcp_old::TCPTahoe::processRexmitTimer(), tcp_old::TCPReno::processRexmitTimer(), tcp_old::TCPTahoe::recalculateSlowStartThreshold(), tcp_old::TCPReno::recalculateSlowStartThreshold(), tcp_old::TCPTahoe::receivedDataAck(), tcp_old::TCPReno::receivedDataAck(), tcp_old::TCPTahoe::receivedDuplicateAck(), tcp_old::TCPReno::receivedDuplicateAck(), tcp_old::TCPBaseAlg::sendData(), and TCPBaseAlgStateVariables().
simtime_t tcp_old::TCPBaseAlgStateVariables::srtt |
round-trip time estimation (Jacobson's algorithm)
smoothed round-trip time
Referenced by tcp_old::TCPBaseAlg::rttMeasurementComplete(), and TCPBaseAlgStateVariables().