RTT/RTO estimator that also maintains min/max/average RTT statistics. More...

Inheritance diagram for ndn::util::RttEstimatorWithStats:

Collaboration diagram for ndn::util::RttEstimatorWithStats:

Public Member Functions
void	addMeasurement (time::nanoseconds rtt, size_t nExpectedSamples=1)
	Records a new RTT measurement. More...

time::nanoseconds	getAvgRtt () const
	Returns the average RTT. More...

time::nanoseconds	getMaxRtt () const
	Returns the maximum RTT observed. More...

time::nanoseconds	getMinRtt () const
	Returns the minimum RTT observed. More...

Private Member Functions
void	backoffRto ()
	Backoff RTO by a factor of Options::rtoBackoffMultiplier. More...

time::nanoseconds	getEstimatedRto () const
	Returns the estimated RTO value. More...

time::nanoseconds	getRttVariation () const
	Returns the RTT variation (RTTVAR). More...

time::nanoseconds	getSmoothedRtt () const
	Returns the smoothed RTT value (SRTT). More...

bool	hasSamples () const

Detailed Description

RTT/RTO estimator that also maintains min/max/average RTT statistics.

Definition at line 126 of file rtt-estimator.hpp.

Member Function Documentation

void ndn::util::RttEstimatorWithStats::addMeasurement	(	time::nanoseconds	rtt,
		size_t	nExpectedSamples = `1`
	)

Records a new RTT measurement.

Parameters

rtt	the sampled RTT
nExpectedSamples	number of expected samples, must be greater than 0. It should be set to the current number of in-flight Interests. Please refer to Appendix G of RFC 7323 for details.

Note: Do not call this function with RTT samples from retransmitted Interests (per Karn's algorithm).

Definition at line 74 of file rtt-estimator.cpp.

time::nanoseconds ndn::util::RttEstimatorWithStats::getAvgRtt ( ) const

inline

Returns the average RTT.

Definition at line 171 of file rtt-estimator.hpp.

time::nanoseconds ndn::util::RttEstimatorWithStats::getMaxRtt ( ) const

inline

Returns the maximum RTT observed.

Definition at line 162 of file rtt-estimator.hpp.

time::nanoseconds ndn::util::RttEstimatorWithStats::getMinRtt ( ) const

inline

Returns the minimum RTT observed.

Definition at line 153 of file rtt-estimator.hpp.