Test the behavior of TCP pacing. More...

Inheritance diagram for TcpPacingTest:

Collaboration diagram for TcpPacingTest:

Public Member Functions
	TcpPacingTest (uint32_t segmentSize, uint32_t packetSize, uint32_t packets, uint16_t pacingSsRatio, uint16_t pacingCaRatio, uint32_t ssThresh, bool paceInitialWindow, uint32_t delAckMaxCount, const TypeId &congControl, const std::string &desc)
	Constructor. More...

Public Member Functions inherited from ns3::TcpGeneralTest
	TcpGeneralTest (const std::string &desc)
	TcpGeneralTest constructor. More...

	~TcpGeneralTest () override

Public Member Functions inherited from ns3::TestCase
	TestCase (const TestCase &)=delete

virtual	~TestCase ()
	Destructor. More...

std::string	GetName () const

TestCase &	operator= (const TestCase &)=delete

Protected Member Functions
void	BytesInFlightTrace (uint32_t oldValue, uint32_t newValue) override

void	ConfigureEnvironment () override
	Change the configuration of the environment. More...

void	ConfigureProperties () override
	Change the configuration of the socket properties. More...

void	CWndTrace (uint32_t oldValue, uint32_t newValue) override

void	NormalClose (SocketWho who) override

void	PhyDrop (SocketWho who) override

void	QueueDrop (SocketWho who) override

void	RttTrace (Time oldTime, Time newTime) override

void	Rx (const Ptr< const Packet > p, const TcpHeader &h, SocketWho who) override
	Packet received from IP layer. More...

void	Tx (const Ptr< const Packet > p, const TcpHeader &h, SocketWho who) override
	Packet transmitted down to IP layer. More...

virtual void	UpdateExpectedInterval ()
	Update the expected interval at which next packet will be sent. More...

Protected Member Functions inherited from ns3::TcpGeneralTest
virtual void	AfterRTOExpired (const Ptr< const TcpSocketState > tcb[[maybe_unused]], SocketWho who[[maybe_unused]])
	Rto has expired. More...

virtual void	BeforeRTOExpired (const Ptr< const TcpSocketState > tcb[[maybe_unused]], SocketWho who[[maybe_unused]])
	Rto has expired. More...

virtual void	BytesInFlightTrace (uint32_t oldValue[[maybe_unused]], uint32_t newValue[[maybe_unused]])
	Bytes in flight changes. More...

virtual void	CongStateTrace (const TcpSocketState::TcpCongState_t oldValue[[maybe_unused]], const TcpSocketState::TcpCongState_t newValue[[maybe_unused]])
	State on Ack state machine changes. More...

virtual Ptr< SimpleChannel >	CreateChannel ()
	Create and return the channel installed between the two socket. More...

virtual Ptr< ErrorModel >	CreateReceiverErrorModel ()
	Create and return the error model to install in the receiver node. More...

virtual Ptr< TcpSocketMsgBase >	CreateReceiverSocket (Ptr< Node > node)
	Create and install the socket to install on the receiver. More...

virtual Ptr< ErrorModel >	CreateSenderErrorModel ()
	Create and return the error model to install in the sender node. More...

virtual Ptr< TcpSocketMsgBase >	CreateSenderSocket (Ptr< Node > node)
	Create and install the socket to install on the sender. More...

virtual Ptr< TcpSocketMsgBase >	CreateSocket (Ptr< Node > node, TypeId socketType, TypeId congControl)
	Create a socket. More...

virtual Ptr< TcpSocketMsgBase >	CreateSocket (Ptr< Node > node, TypeId socketType, TypeId congControl, TypeId recoveryAlgorithm)
	Create a socket. More...

virtual void	CWndInflTrace (uint32_t oldValue[[maybe_unused]], uint32_t newValue[[maybe_unused]])
	Tracks the inflated congestion window changes. More...

virtual void	CWndTrace (uint32_t oldValue[[maybe_unused]], uint32_t newValue[[maybe_unused]])
	Tracks the congestion window changes. More...

virtual void	DataSent (uint32_t size[[maybe_unused]], SocketWho who[[maybe_unused]])
	Notifying application for sent data. More...

void	DoConnect ()
	Scheduled at 0.0, SENDER starts the connection to RECEIVER. More...

void	DoRun () override
	Execute the tcp test. More...

void	DoTeardown () override
	Teardown the TCP test. More...

virtual void	ErrorClose (SocketWho who[[maybe_unused]])
	Socket closed with an error. More...

virtual void	FinalChecks ()
	Performs the (eventual) final checks through test asserts. More...

Time	GetClockGranularity (SocketWho who)
	Get the clock granularity attribute. More...

Time	GetConnTimeout (SocketWho who)
	Get the retransmission time for the SYN segments. More...

uint32_t	GetDelAckCount (SocketWho who)
	Get the number of delayed ack (if present) More...

Time	GetDelAckTimeout (SocketWho who)
	Get the timeout of delayed ack (if present) More...

uint32_t	GetDupAckCount (SocketWho who)
	Get the number of dupack received. More...

SequenceNumber32	GetHighestTxMark (SocketWho who)
	Get the highest tx mark of the node specified. More...

uint32_t	GetInitialCwnd (SocketWho who)
	Get the initial congestion window. More...

uint32_t	GetInitialSsThresh (SocketWho who)
	Get the initial slow start threshold. More...

Time	GetMinRto (SocketWho who)
	Get the minimum RTO attribute. More...

uint32_t	GetMtu () const
	Get the MTU of the environment. More...

EventId	GetPersistentEvent (SocketWho who)
	Get the persistent event of the selected socket. More...

Time	GetPersistentTimeout (SocketWho who)
	Get the persistent timeout of the selected socket. More...

uint32_t	GetPktCount () const
	Get the number of application packets. More...

Time	GetPktInterval () const
	Get the interval to wait for each packet sent down from application to TCP. More...

uint32_t	GetPktSize () const
	Get the application packet size. More...

Time	GetPropagationDelay () const
	Get the channel Propagation Delay. More...

Ptr< TcpSocketMsgBase >	GetReceiverSocket ()
	Get the pointer to a previously created receiver socket. More...

uint32_t	GetReTxThreshold (SocketWho who)
	Get the retransmission threshold. More...

Time	GetRto (SocketWho who)
	Get the retransmission time. More...

Ptr< RttEstimator >	GetRttEstimator (SocketWho who)
	Get the Rtt estimator of the socket. More...

uint32_t	GetRWnd (SocketWho who)
	Get the rWnd of the selected socket. More...

Ptr< TcpRxBuffer >	GetRxBuffer (SocketWho who)
	Get the Rx buffer from selected socket. More...

uint32_t	GetSegSize (SocketWho who)
	Get the segment size of the node specified. More...

Ptr< TcpSocketMsgBase >	GetSenderSocket ()
	Get the pointer to a previously created sender socket. More...

Time	GetStartTime () const
	Get the data start time. More...

Ptr< TcpSocketState >	GetTcb (SocketWho who)
	Get the TCB from selected socket. More...

TcpSocket::TcpStates_t	GetTcpState (SocketWho who)
	Get the state of the TCP state machine. More...

Ptr< TcpTxBuffer >	GetTxBuffer (SocketWho who)
	Get the Tx buffer from selected socket. More...

virtual void	HighestTxSeqTrace (SequenceNumber32 oldValue[[maybe_unused]], SequenceNumber32 newValue[[maybe_unused]])
	Highest tx seq changes. More...

virtual void	NextTxSeqTrace (SequenceNumber32 oldValue[[maybe_unused]], SequenceNumber32 newValue[[maybe_unused]])
	Next tx seq changes. More...

virtual void	NormalClose (SocketWho who[[maybe_unused]])
	Socket closed normally. More...

virtual void	PhyDrop (SocketWho who[[maybe_unused]])
	Link drop. More...

virtual void	ProcessedAck (const Ptr< const TcpSocketState > tcb[[maybe_unused]], const TcpHeader &h[[maybe_unused]], SocketWho who[[maybe_unused]])
	Processed ack. More...

virtual void	QueueDrop (SocketWho who[[maybe_unused]])
	Drop on the queue. More...

virtual void	RateSampleUpdatedTrace (const TcpRateLinux::TcpRateSample &sample[[maybe_unused]])
	Track the rate sample value of TcpRateLinux. More...

virtual void	RateUpdatedTrace (const TcpRateLinux::TcpRateConnection &rate[[maybe_unused]])
	Track the rate value of TcpRateLinux. More...

virtual void	RcvAck (const Ptr< const TcpSocketState > tcb[[maybe_unused]], const TcpHeader &h[[maybe_unused]], SocketWho who[[maybe_unused]])
	Received ack. More...

virtual void	ReceivePacket (Ptr< Socket > socket)
	Packet received. More...

virtual void	RtoTrace (Time oldValue[[maybe_unused]], Time newValue[[maybe_unused]])
	RTO changes. More...

virtual void	RttTrace (Time oldTime[[maybe_unused]], Time newTime[[maybe_unused]])
	Rtt changes. More...

void	SendPacket (Ptr< Socket > socket, uint32_t pktSize, uint32_t pktCount, Time pktInterval)
	Send packets to other endpoint. More...

void	SetAppPktCount (uint32_t pktCount)
	Set app packet count. More...

void	SetAppPktInterval (Time pktInterval)
	Interval between app-generated packet. More...

void	SetAppPktSize (uint32_t pktSize)
	Set app packet size. More...

void	SetCongestionControl (TypeId congControl)
	Congestion control of the sender socket. More...

void	SetDelAckMaxCount (SocketWho who, uint32_t count)
	Forcefully set the delayed acknowledgement count. More...

void	SetInitialCwnd (SocketWho who, uint32_t initialCwnd)
	Forcefully set the initial cwnd. More...

void	SetInitialSsThresh (SocketWho who, uint32_t initialSsThresh)
	Forcefully set the initial ssthresh. More...

void	SetMTU (uint32_t mtu)
	MTU of the bottleneck link. More...

void	SetPaceInitialWindow (SocketWho who, bool paceWindow)
	Enable or disable pacing of the initial window. More...

void	SetPacingStatus (SocketWho who, bool pacing)
	Enable or disable pacing in the TCP socket. More...

void	SetPropagationDelay (Time propDelay)
	Propagation delay of the bottleneck link. More...

void	SetRcvBufSize (SocketWho who, uint32_t size)
	Forcefully set a defined size for rx buffer. More...

void	SetRecoveryAlgorithm (TypeId recovery)
	recovery algorithm of the sender socket More...

void	SetSegmentSize (SocketWho who, uint32_t segmentSize)
	Forcefully set the segment size. More...

void	SetTransmitStart (Time startTime)
	Set the initial time at which the application sends the first data packet. More...

void	SetUseEcn (SocketWho who, TcpSocketState::UseEcn_t useEcn)
	Forcefully set the ECN mode of use. More...

virtual void	SsThreshTrace (uint32_t oldValue[[maybe_unused]], uint32_t newValue[[maybe_unused]])
	Slow start threshold changes. More...

virtual void	UpdatedRttHistory (const SequenceNumber32 &seq[[maybe_unused]], uint32_t sz[[maybe_unused]], bool isRetransmission[[maybe_unused]], SocketWho who[[maybe_unused]])
	Updated the Rtt history. More...

Protected Member Functions inherited from ns3::TestCase
	TestCase (std::string name)
	Constructor. More...

void	AddTestCase (TestCase *testCase, TestDuration duration=QUICK)
	Add an individual child TestCase to this test suite. More...

TestCase *	GetParent () const
	Get the parent of this TestCase. More...

bool	IsStatusFailure () const
	Check if any tests failed. More...

bool	IsStatusSuccess () const
	Check if all tests passed. More...

void	SetDataDir (std::string directory)
	Set the data directory where reference trace files can be found. More...

void	ReportTestFailure (std::string cond, std::string actual, std::string limit, std::string message, std::string file, int32_t line)
	Log the failure of this TestCase. More...

bool	MustAssertOnFailure () const
	Check if this run should assert on failure. More...

bool	MustContinueOnFailure () const
	Check if this run should continue on failure. More...

std::string	CreateDataDirFilename (std::string filename)
	Construct the full path to a file in the data directory. More...

std::string	CreateTempDirFilename (std::string filename)
	Construct the full path to a file in a temporary directory. More...

Private Attributes
uint32_t	m_bytesInFlight
	Current bytes in flight. More...

uint32_t	m_curCwnd
	Current sender cWnd. More...

uint32_t	m_delAckMaxCount
	Delayed ack count for receiver. More...

EventId	m_event
	Check event. More...

Time	m_expectedInterval
	Theoretical estimate of the time at which next packet is scheduled for transmission. More...

bool	m_initial
	True on first run. More...

uint32_t	m_initialCwnd
	Initial value of cWnd. More...

bool	m_isConnAboutToEnd
	True when sender receives a FIN/ACK from receiver. More...

bool	m_isFullCwndSent
	True if all bytes for that cWnd is sent and sender is waiting for an ACK. More...

Time	m_nextPacketInterval
	Time maintained by Tx () trace about interval at which next packet will be sent. More...

bool	m_paceInitialWindow
	True if initial window should be paced. More...

uint16_t	m_pacingCaRatio
	Pacing factor during Congestion Avoidance. More...

uint16_t	m_pacingSsRatio
	Pacing factor during Slow Start. More...

uint32_t	m_packets
	Number of packets. More...

uint32_t	m_packetSize
	Size of the packets. More...

uint32_t	m_packetsSent
	Number of packets sent by sender so far. More...

Time	m_prevTxTime
	Time when Tx was previously called. More...

uint32_t	m_segmentSize
	Segment size. More...

uint32_t	m_ssThresh
	Slow start threshold. More...

Time	m_tracedRtt
	Traced value of RTT, which may be different from the environment RTT in case of delayed ACKs. More...

Time	m_transmissionStartTime
	Time at which sender starts data transmission. More...

Additional Inherited Members
Public Types inherited from ns3::TcpGeneralTest
enum	SocketWho { SENDER , RECEIVER }
	Used as parameter of methods, specifies on what node the caller is interested (e.g. More...

Public Types inherited from ns3::TestCase
enum	TestDuration { QUICK = 1 , EXTENSIVE = 2 , TAKES_FOREVER = 3 }
	How long the test takes to execute. More...

Protected Attributes inherited from ns3::TcpGeneralTest
TypeId	m_congControlTypeId
	Congestion control. More...

TypeId	m_recoveryTypeId
	Recovery. More...

Detailed Description

Test the behavior of TCP pacing.

This test checks that packets are paced at correct intervals. The test uses a shadow pacing rate calculation assumed to match the internal pacing calculation. Therefore, if you modify the values of pacingSsRatio and pacingCaRatio herein, ensure that you also change values used in the TCP implementation to match.

This test environment uses an RTT of 100ms The time interval between two consecutive packet transmissions is measured Pacing rate should be at least cwnd / rtt to transmit cwnd segments per rtt. Linux multiples this basic ratio by an additional factor, to yield pacingRate = (factor * cwnd) / rtt Since pacingRate can also be written as segmentSize / interval we can solve for interval = (segmentSize * rtt) / (factor * cwnd)

The test checks whether the measured interval lies within a tolerance value of the expected interval. The tolerance or error margin was chosen to be 10 Nanoseconds, that could be due to delay introduced by the application's send process.

This check should not be performed for a packet transmission after the sender has sent all bytes corresponding to the window and is awaiting an ACK from the receiver (corresponding to m_isFullCwndSent). Pacing check should be performed when the sender is actively sending packets from cwnd.

The same argument applies when the sender has finished sending packets and is awaiting a FIN/ACK from the receiver, to send the final ACK

As can be seen in TcpSocketBase::UpdatePacingRate (), different pacing ratios are used when cwnd < ssThresh / 2 and when cwnd > ssThresh / 2

A few key points to note:

In TcpSocketBase, pacing rate is updated whenever an ACK is received.
The factors that could contribute to a different value of pacing rate include congestion window and RTT.
However, the cWnd trace is called after Rx () trace and we therefore update the expected interval in cWnd trace.
An RTT trace is also necessary, since using delayed ACKs may lead to a higher RTT measurement at the sender's end. The expected interval should be updated here as well.
When sending the current packet, TcpSocketBase automatically decides the time at which next packet should be sent. So, if say packet 3 is sent and an ACK is received before packet 4 is sent (thus updating the pacing rate), this does not change the time at which packet 4 is to be sent. When packet 4 is indeed sent later, the new pacing rate is used to decide when packet 5 will be sent. This behavior is captured in m_nextPacketInterval, which is not affected by change of pacing rate before the next packet is sent. The important observation here is to realize the contrast between m_expectedInterval and m_nextPacketInterval.

Definition at line 89 of file tcp-pacing-test.cc.

Constructor & Destructor Documentation

◆ TcpPacingTest()

TcpPacingTest::TcpPacingTest	(	uint32_t	segmentSize,
		uint32_t	packetSize,
		uint32_t	packets,
		uint16_t	pacingSsRatio,
		uint16_t	pacingCaRatio,
		uint32_t	ssThresh,
		bool	paceInitialWindow,
		uint32_t	delAckMaxCount,
		const TypeId &	congControl,
		const std::string &	desc
	)

Constructor.

Parameters

segmentSize	Segment size at the TCP layer (bytes).
packetSize	Size of packets sent at the application layer (bytes).
packets	Number of packets.
pacingSsRatio	Pacing Ratio during Slow Start (multiplied by 100)
pacingCaRatio	Pacing Ratio during Congestion Avoidance (multiplied by 100)
ssThresh	slow start threshold (bytes)
paceInitialWindow	whether to pace the initial window
delAckMaxCount	Delayed ACK max count parameter
congControl	Type of congestion control.
desc	The test description.

Definition at line 162 of file tcp-pacing-test.cc.

References ns3::TcpGeneralTest::m_congControlTypeId.

Member Function Documentation

◆ BytesInFlightTrace()

void TcpPacingTest::BytesInFlightTrace	(	uint32_t	oldValue,
		uint32_t	newValue
	)

overrideprotected

Definition at line 247 of file tcp-pacing-test.cc.

References m_bytesInFlight.

◆ ConfigureEnvironment()

void TcpPacingTest::ConfigureEnvironment ( )

overrideprotectedvirtual

Change the configuration of the environment.

Reimplemented from ns3::TcpGeneralTest.

Definition at line 198 of file tcp-pacing-test.cc.

References m_packets, m_packetSize, ns3::MilliSeconds(), ns3::NanoSeconds(), ns3::Seconds(), ns3::TcpGeneralTest::SetAppPktCount(), ns3::TcpGeneralTest::SetAppPktInterval(), ns3::TcpGeneralTest::SetAppPktSize(), ns3::TcpGeneralTest::SetMTU(), ns3::TcpGeneralTest::SetPropagationDelay(), and ns3::TcpGeneralTest::SetTransmitStart().

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◆ ConfigureProperties()

void TcpPacingTest::ConfigureProperties ( )

overrideprotectedvirtual

Change the configuration of the socket properties.

Reimplemented from ns3::TcpGeneralTest.

Definition at line 210 of file tcp-pacing-test.cc.

References m_delAckMaxCount, m_initialCwnd, m_paceInitialWindow, m_segmentSize, m_ssThresh, NS_LOG_DEBUG, ns3::TcpGeneralTest::RECEIVER, ns3::TcpGeneralTest::SENDER, ns3::TcpGeneralTest::SetDelAckMaxCount(), ns3::TcpGeneralTest::SetInitialCwnd(), ns3::TcpGeneralTest::SetInitialSsThresh(), ns3::TcpGeneralTest::SetPaceInitialWindow(), ns3::TcpGeneralTest::SetPacingStatus(), and ns3::TcpGeneralTest::SetSegmentSize().

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◆ CWndTrace()

void TcpPacingTest::CWndTrace	(	uint32_t	oldValue,
		uint32_t	newValue
	)

overrideprotected

Definition at line 233 of file tcp-pacing-test.cc.

References m_curCwnd, m_initial, NS_LOG_FUNCTION, and UpdateExpectedInterval().

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◆ NormalClose()

void TcpPacingTest::NormalClose ( SocketWho who )

overrideprotected

Definition at line 358 of file tcp-pacing-test.cc.

References ns3::EventId::Cancel(), m_event, and ns3::TcpGeneralTest::SENDER.

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◆ PhyDrop()

void TcpPacingTest::PhyDrop ( SocketWho who )

overrideprotected

Definition at line 352 of file tcp-pacing-test.cc.

References NS_FATAL_ERROR.

◆ QueueDrop()

void TcpPacingTest::QueueDrop ( SocketWho who )

overrideprotected

Definition at line 346 of file tcp-pacing-test.cc.

References NS_FATAL_ERROR.

◆ RttTrace()

void TcpPacingTest::RttTrace	(	Time	oldTime,
		Time	newTime
	)

overrideprotected

Definition at line 225 of file tcp-pacing-test.cc.

References m_tracedRtt, NS_LOG_FUNCTION, and UpdateExpectedInterval().

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◆ Rx()

void TcpPacingTest::Rx	(	const Ptr< const Packet >	p,
		const TcpHeader &	h,
		SocketWho	who
	)

overrideprotectedvirtual

Packet received from IP layer.

Parameters

p	packet
h	header
who	the socket which has received the packet (SENDER or RECEIVER)

Reimplemented from ns3::TcpGeneralTest.

Definition at line 280 of file tcp-pacing-test.cc.

References ns3::TcpHeader::GetFlags(), m_isConnAboutToEnd, NS_LOG_DEBUG, and ns3::TcpGeneralTest::SENDER.

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◆ Tx()

void TcpPacingTest::Tx	(	const Ptr< const Packet >	p,
		const TcpHeader &	h,
		SocketWho	who
	)

overrideprotectedvirtual

Packet transmitted down to IP layer.

Parameters

p	packet
h	header
who	the socket which has received the packet (SENDER or RECEIVER)

Reimplemented from ns3::TcpGeneralTest.

Definition at line 301 of file tcp-pacing-test.cc.

References ns3::Time::GetSeconds(), m_bytesInFlight, m_curCwnd, m_expectedInterval, m_isConnAboutToEnd, m_isFullCwndSent, m_nextPacketInterval, m_packetsSent, m_prevTxTime, m_segmentSize, ns3::NanoSeconds(), ns3::Now(), NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_TEST_ASSERT_MSG_LT_OR_EQ, and ns3::TcpGeneralTest::SENDER.

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◆ UpdateExpectedInterval()

void TcpPacingTest::UpdateExpectedInterval ( )

protectedvirtual

Update the expected interval at which next packet will be sent.

Definition at line 253 of file tcp-pacing-test.cc.

References ns3::TcpGeneralTest::GetPropagationDelay(), ns3::Time::GetSeconds(), m_curCwnd, m_expectedInterval, m_initialCwnd, m_paceInitialWindow, m_pacingCaRatio, m_pacingSsRatio, m_segmentSize, m_ssThresh, m_tracedRtt, and ns3::Seconds().

Referenced by CWndTrace(), and RttTrace().

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Member Data Documentation

◆ m_bytesInFlight

uint32_t TcpPacingTest::m_bytesInFlight

private

Current bytes in flight.

Definition at line 144 of file tcp-pacing-test.cc.

Referenced by BytesInFlightTrace(), and Tx().

◆ m_curCwnd

uint32_t TcpPacingTest::m_curCwnd

private

Current sender cWnd.

Definition at line 141 of file tcp-pacing-test.cc.

Referenced by CWndTrace(), Tx(), and UpdateExpectedInterval().

◆ m_delAckMaxCount

uint32_t TcpPacingTest::m_delAckMaxCount

private

Delayed ack count for receiver.

Definition at line 150 of file tcp-pacing-test.cc.

Referenced by ConfigureProperties().

◆ m_event

EventId TcpPacingTest::m_event

private

Check event.

Definition at line 138 of file tcp-pacing-test.cc.

Referenced by NormalClose().

◆ m_expectedInterval

Time TcpPacingTest::m_expectedInterval

private

Theoretical estimate of the time at which next packet is scheduled for transmission.

Definition at line 153 of file tcp-pacing-test.cc.

Referenced by Tx(), and UpdateExpectedInterval().

◆ m_initial

bool TcpPacingTest::m_initial

private

True on first run.

Definition at line 139 of file tcp-pacing-test.cc.

Referenced by CWndTrace().

◆ m_initialCwnd

uint32_t TcpPacingTest::m_initialCwnd

private

Initial value of cWnd.

Definition at line 140 of file tcp-pacing-test.cc.

Referenced by ConfigureProperties(), and UpdateExpectedInterval().

◆ m_isConnAboutToEnd

bool TcpPacingTest::m_isConnAboutToEnd

private

True when sender receives a FIN/ACK from receiver.

Definition at line 151 of file tcp-pacing-test.cc.

Referenced by Rx(), and Tx().

◆ m_isFullCwndSent

bool TcpPacingTest::m_isFullCwndSent

private

True if all bytes for that cWnd is sent and sender is waiting for an ACK.

Definition at line 142 of file tcp-pacing-test.cc.

Referenced by Tx().

◆ m_nextPacketInterval

Time TcpPacingTest::m_nextPacketInterval

private

Time maintained by Tx () trace about interval at which next packet will be sent.

Definition at line 156 of file tcp-pacing-test.cc.

Referenced by Tx().

◆ m_paceInitialWindow

bool TcpPacingTest::m_paceInitialWindow

private

True if initial window should be paced.

Definition at line 149 of file tcp-pacing-test.cc.

Referenced by ConfigureProperties(), and UpdateExpectedInterval().

◆ m_pacingCaRatio

uint16_t TcpPacingTest::m_pacingCaRatio

private

Pacing factor during Congestion Avoidance.

Definition at line 147 of file tcp-pacing-test.cc.

Referenced by UpdateExpectedInterval().

◆ m_pacingSsRatio

uint16_t TcpPacingTest::m_pacingSsRatio

private

Pacing factor during Slow Start.

Definition at line 146 of file tcp-pacing-test.cc.

Referenced by UpdateExpectedInterval().

◆ m_packets

uint32_t TcpPacingTest::m_packets

private

Number of packets.

Definition at line 137 of file tcp-pacing-test.cc.

Referenced by ConfigureEnvironment().

◆ m_packetSize

uint32_t TcpPacingTest::m_packetSize

private

Size of the packets.

Definition at line 136 of file tcp-pacing-test.cc.

Referenced by ConfigureEnvironment().

◆ m_packetsSent

uint32_t TcpPacingTest::m_packetsSent

private

Number of packets sent by sender so far.

Definition at line 155 of file tcp-pacing-test.cc.

Referenced by Tx().

◆ m_prevTxTime

Time TcpPacingTest::m_prevTxTime

private

Time when Tx was previously called.

Definition at line 145 of file tcp-pacing-test.cc.

Referenced by Tx().

◆ m_segmentSize

uint32_t TcpPacingTest::m_segmentSize

private

Segment size.

Definition at line 135 of file tcp-pacing-test.cc.

Referenced by ConfigureProperties(), Tx(), and UpdateExpectedInterval().

◆ m_ssThresh

uint32_t TcpPacingTest::m_ssThresh

private

Slow start threshold.

Definition at line 148 of file tcp-pacing-test.cc.

Referenced by ConfigureProperties(), and UpdateExpectedInterval().

◆ m_tracedRtt

Time TcpPacingTest::m_tracedRtt

private

Traced value of RTT, which may be different from the environment RTT in case of delayed ACKs.

Definition at line 158 of file tcp-pacing-test.cc.

Referenced by RttTrace(), and UpdateExpectedInterval().

◆ m_transmissionStartTime

Time TcpPacingTest::m_transmissionStartTime

private

Time at which sender starts data transmission.

Definition at line 152 of file tcp-pacing-test.cc.

The documentation for this class was generated from the following file:

src/internet/test/tcp-pacing-test.cc

Public Member Functions

Protected Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ TcpPacingTest()

Member Function Documentation

◆ BytesInFlightTrace()

◆ ConfigureEnvironment()

◆ ConfigureProperties()

◆ CWndTrace()

◆ NormalClose()

◆ PhyDrop()

◆ QueueDrop()

◆ RttTrace()

◆ Rx()

◆ Tx()

◆ UpdateExpectedInterval()

Member Data Documentation

◆ m_bytesInFlight

◆ m_curCwnd

◆ m_delAckMaxCount

◆ m_event

◆ m_expectedInterval

◆ m_initial

◆ m_initialCwnd

◆ m_isConnAboutToEnd

◆ m_isFullCwndSent

◆ m_nextPacketInterval

◆ m_paceInitialWindow

◆ m_pacingCaRatio

◆ m_pacingSsRatio

◆ m_packets

◆ m_packetSize

◆ m_packetsSent

◆ m_prevTxTime

◆ m_segmentSize

◆ m_ssThresh

◆ m_tracedRtt

◆ m_transmissionStartTime