Namespace inet::tcp

TcpVegasStateVariables

struct

State variables for TcpVegas.

Extends

Name	Type	Description
TcpBaseAlgStateVariables	(unknown -- not in documented files)

Fields

Name	Type	Description
v_recoverypoint	uint32_t
v_cwnd_changed	simtime_t	last time cwnd changes because of a rtx.
v_baseRTT	simtime_t
v_sumRTT	simtime_t	sum of rtt's measured within one RTT
v_cntRTT	int	# of rtt's measured within one RTT
v_begseq	uint32_t	register next pkt to be sent,for rtt calculation in receivedDataAck
v_begtime	simtime_t	register time for rtt calculation
v_rtt_timeout	simtime_t	vegas fine-grained timeout
v_sa	simtime_t	average for vegas fine-grained timeout
v_sd	simtime_t	deviation for vegas fine-grained timeout
regions	TcpSegmentTransmitInfoList
ssthresh	uint32_t	< slow start threshold
v_inc_flag	bool	for slow start: "exponential growth only every other RTT"
v_incr_ss	bool	to control no incr. cwnd if during slowstart ssthresh has been exceeded before the rtt is over
v_incr	int32_t	incr/decr
v_worried	uint32_t	pkts a to retransmit due to vegas fine-grained timeout

Source code

///
/// State variables for TcpVegas.
///
struct TcpVegasStateVariables extends TcpBaseAlgStateVariables
{
    @descriptor(readonly);

    uint32_t v_recoverypoint = 0;
    simtime_t v_cwnd_changed = 0; // last time cwnd changes because of a rtx.

    simtime_t v_baseRTT = SIMTIME_MAX;
    simtime_t v_sumRTT = SIMTIME_ZERO; // sum of rtt's measured within one RTT
    int v_cntRTT = 0; // # of rtt's measured within one RTT
    uint32_t v_begseq = 0; // register next pkt to be sent,for rtt calculation in receivedDataAck
    simtime_t v_begtime = 0; // register time for rtt calculation

    simtime_t v_rtt_timeout = 1000.0; // vegas fine-grained timeout
    simtime_t v_sa; // average for vegas fine-grained timeout
    simtime_t v_sd; // deviation for vegas fine-grained timeout

    TcpSegmentTransmitInfoList regions;

    uint32_t ssthresh = 65536; ///< slow start threshold

    bool v_inc_flag = true; // for slow start: "exponential growth only every other RTT"
    bool v_incr_ss = false; // to control no incr. cwnd if during slowstart ssthresh has been exceeded before the rtt is over
    int32_t v_incr = 0; // incr/decr
    uint32_t v_worried = 0; // pkts a to retransmit due to vegas fine-grained timeout
}

File: src/inet/transportlayer/tcp/flavours/TcpVegasState.msg