This unit test checks that the slow start and congestion avoidance behavior matches Linux behavior as follows: 1) in both slow start and congestion avoidance phases, presence or absence of delayed acks does not alter the window growth 2) in congestion avoidance phase, the arithmetic for counting the number of segments acked and deciding when to increment the congestion window (i.e. More...
Public Member Functions | |
TcpLinuxRenoSSTest (uint32_t segmentSize, uint32_t packetSize, uint32_t packets, uint32_t initialCwnd, uint32_t delayedAck, uint32_t expectedCwnd, TypeId &congControl, const std::string &desc) | |
Constructor. | |
Public Member Functions inherited from ns3::TcpGeneralTest | |
TcpGeneralTest (const std::string &desc) | |
TcpGeneralTest constructor. | |
~TcpGeneralTest () override | |
Public Member Functions inherited from ns3::TestCase | |
TestCase (const TestCase &)=delete | |
virtual | ~TestCase () |
< | |
std::string | GetName () const |
TestCase & | operator= (const TestCase &)=delete |
Protected Member Functions | |
void | ConfigureEnvironment () override |
Change the configuration of the environment. | |
void | ConfigureProperties () override |
Change the configuration of the socket properties. | |
void | CWndTrace (uint32_t oldValue, uint32_t newValue) override |
Tracks the congestion window changes. | |
void | DoTeardown () override |
Teardown the TCP test. | |
void | PhyDrop (SocketWho who) override |
Link drop. | |
void | QueueDrop (SocketWho who) override |
Drop on the queue. | |
Protected Member Functions inherited from ns3::TcpGeneralTest | |
virtual void | AfterRTOExpired (const Ptr< const TcpSocketState > tcb, SocketWho who) |
Rto has expired. | |
virtual void | BeforeRTOExpired (const Ptr< const TcpSocketState > tcb, SocketWho who) |
Rto has expired. | |
virtual void | BytesInFlightTrace (uint32_t oldValue, uint32_t newValue) |
Bytes in flight changes. | |
virtual void | CongStateTrace (const TcpSocketState::TcpCongState_t oldValue, const TcpSocketState::TcpCongState_t newValue) |
State on Ack state machine changes. | |
virtual Ptr< SimpleChannel > | CreateChannel () |
Create and return the channel installed between the two socket. | |
virtual Ptr< ErrorModel > | CreateReceiverErrorModel () |
Create and return the error model to install in the receiver node. | |
virtual Ptr< TcpSocketMsgBase > | CreateReceiverSocket (Ptr< Node > node) |
Create and install the socket to install on the receiver. | |
virtual Ptr< ErrorModel > | CreateSenderErrorModel () |
Create and return the error model to install in the sender node. | |
virtual Ptr< TcpSocketMsgBase > | CreateSenderSocket (Ptr< Node > node) |
Create and install the socket to install on the sender. | |
virtual Ptr< TcpSocketMsgBase > | CreateSocket (Ptr< Node > node, TypeId socketType, TypeId congControl) |
Create a socket. | |
virtual Ptr< TcpSocketMsgBase > | CreateSocket (Ptr< Node > node, TypeId socketType, TypeId congControl, TypeId recoveryAlgorithm) |
Create a socket. | |
virtual void | CWndInflTrace (uint32_t oldValue, uint32_t newValue) |
Tracks the inflated congestion window changes. | |
virtual void | DataSent (uint32_t size, SocketWho who) |
Notifying application for sent data. | |
void | DoConnect () |
Scheduled at 0.0, SENDER starts the connection to RECEIVER. | |
void | DoRun () override |
Execute the tcp test. | |
virtual void | ErrorClose (SocketWho who) |
Socket closed with an error. | |
virtual void | FinalChecks () |
Performs the (eventual) final checks through test asserts. | |
Time | GetClockGranularity (SocketWho who) |
Get the clock granularity attribute. | |
Time | GetConnTimeout (SocketWho who) |
Get the retransmission time for the SYN segments. | |
uint32_t | GetDelAckCount (SocketWho who) |
Get the number of delayed ack (if present) | |
Time | GetDelAckTimeout (SocketWho who) |
Get the timeout of delayed ack (if present) | |
uint32_t | GetDupAckCount (SocketWho who) |
Get the number of dupack received. | |
SequenceNumber32 | GetHighestTxMark (SocketWho who) |
Get the highest tx mark of the node specified. | |
uint32_t | GetInitialCwnd (SocketWho who) |
Get the initial congestion window. | |
uint32_t | GetInitialSsThresh (SocketWho who) |
Get the initial slow start threshold. | |
Time | GetMinRto (SocketWho who) |
Get the minimum RTO attribute. | |
uint32_t | GetMtu () const |
Get the MTU of the environment. | |
EventId | GetPersistentEvent (SocketWho who) |
Get the persistent event of the selected socket. | |
Time | GetPersistentTimeout (SocketWho who) |
Get the persistent timeout of the selected socket. | |
uint32_t | GetPktCount () const |
Get the number of application packets. | |
Time | GetPktInterval () const |
Get the interval to wait for each packet sent down from application to TCP. | |
uint32_t | GetPktSize () const |
Get the application packet size. | |
Time | GetPropagationDelay () const |
Get the channel Propagation Delay. | |
Ptr< TcpSocketMsgBase > | GetReceiverSocket () |
Get the pointer to a previously created receiver socket. | |
uint32_t | GetReTxThreshold (SocketWho who) |
Get the retransmission threshold. | |
Time | GetRto (SocketWho who) |
Get the retransmission time. | |
Ptr< RttEstimator > | GetRttEstimator (SocketWho who) |
Get the Rtt estimator of the socket. | |
uint32_t | GetRWnd (SocketWho who) |
Get the rWnd of the selected socket. | |
Ptr< TcpRxBuffer > | GetRxBuffer (SocketWho who) |
Get the Rx buffer from selected socket. | |
uint32_t | GetSegSize (SocketWho who) |
Get the segment size of the node specified. | |
Ptr< TcpSocketMsgBase > | GetSenderSocket () |
Get the pointer to a previously created sender socket. | |
Time | GetStartTime () const |
Get the data start time. | |
Ptr< TcpSocketState > | GetTcb (SocketWho who) |
Get the TCB from selected socket. | |
TcpSocket::TcpStates_t | GetTcpState (SocketWho who) |
Get the state of the TCP state machine. | |
Ptr< TcpTxBuffer > | GetTxBuffer (SocketWho who) |
Get the Tx buffer from selected socket. | |
virtual void | HighestTxSeqTrace (SequenceNumber32 oldValue, SequenceNumber32 newValue) |
Highest tx seq changes. | |
virtual void | NextTxSeqTrace (SequenceNumber32 oldValue, SequenceNumber32 newValue) |
Next tx seq changes. | |
virtual void | NormalClose (SocketWho who) |
Socket closed normally. | |
virtual void | ProcessedAck (const Ptr< const TcpSocketState > tcb, const TcpHeader &h, SocketWho who) |
Processed ack. | |
virtual void | RateSampleUpdatedTrace (const TcpRateLinux::TcpRateSample &sample) |
Track the rate sample value of TcpRateLinux. | |
virtual void | RateUpdatedTrace (const TcpRateLinux::TcpRateConnection &rate) |
Track the rate value of TcpRateLinux. | |
virtual void | RcvAck (const Ptr< const TcpSocketState > tcb, const TcpHeader &h, SocketWho who) |
Received ack. | |
virtual void | ReceivePacket (Ptr< Socket > socket) |
Packet received. | |
virtual void | RtoTrace (Time oldValue, Time newValue) |
RTO changes. | |
virtual void | RttTrace (Time oldTime, Time newTime) |
Rtt changes. | |
void | SendPacket (Ptr< Socket > socket, uint32_t pktSize, uint32_t pktCount, Time pktInterval) |
Send packets to other endpoint. | |
void | SetAppPktCount (uint32_t pktCount) |
Set app packet count. | |
void | SetAppPktInterval (Time pktInterval) |
Interval between app-generated packet. | |
void | SetAppPktSize (uint32_t pktSize) |
Set app packet size. | |
void | SetCongestionControl (TypeId congControl) |
Congestion control of the sender socket. | |
void | SetDelAckMaxCount (SocketWho who, uint32_t count) |
Forcefully set the delayed acknowledgement count. | |
void | SetInitialCwnd (SocketWho who, uint32_t initialCwnd) |
Forcefully set the initial cwnd. | |
void | SetInitialSsThresh (SocketWho who, uint32_t initialSsThresh) |
Forcefully set the initial ssthresh. | |
void | SetMTU (uint32_t mtu) |
MTU of the bottleneck link. | |
void | SetPaceInitialWindow (SocketWho who, bool paceWindow) |
Enable or disable pacing of the initial window. | |
void | SetPacingStatus (SocketWho who, bool pacing) |
Enable or disable pacing in the TCP socket. | |
void | SetPropagationDelay (Time propDelay) |
Propagation delay of the bottleneck link. | |
void | SetRcvBufSize (SocketWho who, uint32_t size) |
Forcefully set a defined size for rx buffer. | |
void | SetRecoveryAlgorithm (TypeId recovery) |
recovery algorithm of the sender socket | |
void | SetSegmentSize (SocketWho who, uint32_t segmentSize) |
Forcefully set the segment size. | |
void | SetTransmitStart (Time startTime) |
Set the initial time at which the application sends the first data packet. | |
void | SetUseEcn (SocketWho who, TcpSocketState::UseEcn_t useEcn) |
Forcefully set the ECN mode of use. | |
virtual void | SsThreshTrace (uint32_t oldValue, uint32_t newValue) |
Slow start threshold changes. | |
virtual void | UpdatedRttHistory (const SequenceNumber32 &seq, uint32_t sz, bool isRetransmission, SocketWho who) |
Updated the Rtt history. | |
Protected Member Functions inherited from ns3::TestCase | |
TestCase (std::string name) | |
Constructor. | |
void | AddTestCase (TestCase *testCase, Duration duration=Duration::QUICK) |
Add an individual child TestCase to this test suite. | |
TestCase * | GetParent () const |
Get the parent of this TestCase. | |
bool | IsStatusFailure () const |
Check if any tests failed. | |
bool | IsStatusSuccess () const |
Check if all tests passed. | |
void | SetDataDir (std::string directory) |
Set the data directory where reference trace files can be found. | |
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. | |
bool | MustAssertOnFailure () const |
Check if this run should assert on failure. | |
bool | MustContinueOnFailure () const |
Check if this run should continue on failure. | |
std::string | CreateDataDirFilename (std::string filename) |
Construct the full path to a file in the data directory. | |
std::string | CreateTempDirFilename (std::string filename) |
Construct the full path to a file in a temporary directory. | |
Protected Attributes | |
bool | m_initial |
First cycle flag. | |
Protected Attributes inherited from ns3::TcpGeneralTest | |
TypeId | m_congControlTypeId |
Congestion control. | |
TypeId | m_recoveryTypeId |
Recovery. | |
Private Member Functions | |
void | Rx (const Ptr< const Packet > p, const TcpHeader &h, SocketWho who) override |
Packet received from IP layer. | |
void | Tx (const Ptr< const Packet > p, const TcpHeader &h, SocketWho who) override |
Packet transmitted down to IP layer. | |
Private Attributes | |
uint32_t | m_delayedAck |
Delayed Acknowledgement. | |
uint32_t | m_expectedCwnd |
Expected final cWnd value. | |
uint32_t | m_initialCwnd |
Initial congestion window. | |
uint32_t | m_lastCwnd |
Last cWnd value reported. | |
uint32_t | m_packets |
Packet counter. | |
uint32_t | m_packetSize |
Packet size. | |
uint32_t | m_segmentSize |
Segment size. | |
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 class | Duration { QUICK = 1 , EXTENSIVE = 2 , TAKES_FOREVER = 3 } |
How long the test takes to execute. More... | |
Static Public Attributes inherited from ns3::TestCase | |
static constexpr auto | EXTENSIVE = Duration::EXTENSIVE |
static constexpr auto | QUICK = Duration::QUICK |
static constexpr auto | TAKES_FOREVER |
This unit test checks that the slow start and congestion avoidance behavior matches Linux behavior as follows: 1) in both slow start and congestion avoidance phases, presence or absence of delayed acks does not alter the window growth 2) in congestion avoidance phase, the arithmetic for counting the number of segments acked and deciding when to increment the congestion window (i.e.
following the Linux function tcp_cong_avoid_ai()) is followed. Different segment sizes (524 bytes and 1500 bytes) are tested.
This is the Slow Start test.
Definition at line 35 of file tcp-linux-reno-test.cc.
TcpLinuxRenoSSTest::TcpLinuxRenoSSTest | ( | uint32_t | segmentSize, |
uint32_t | packetSize, | ||
uint32_t | packets, | ||
uint32_t | initialCwnd, | ||
uint32_t | delayedAck, | ||
uint32_t | expectedCwnd, | ||
TypeId & | congControl, | ||
const std::string & | desc ) |
Constructor.
segmentSize | Segment size. |
packetSize | Size of the packets. |
packets | Number of packets. |
initialCwnd | Initial congestion window |
delayedAck | Delayed Acknowledgement |
expectedCwnd | Expected value of m_cWnd |
congControl | Type of congestion control. |
desc | The test description. |
Definition at line 81 of file tcp-linux-reno-test.cc.
References ns3::TcpGeneralTest::m_congControlTypeId.
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overrideprotectedvirtual |
Change the configuration of the environment.
Reimplemented from ns3::TcpGeneralTest.
Definition at line 103 of file tcp-linux-reno-test.cc.
References ns3::TcpGeneralTest::ConfigureEnvironment(), m_packets, m_packetSize, ns3::MilliSeconds(), ns3::TcpGeneralTest::SetAppPktCount(), ns3::TcpGeneralTest::SetAppPktSize(), and ns3::TcpGeneralTest::SetPropagationDelay().
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overrideprotectedvirtual |
Change the configuration of the socket properties.
Reimplemented from ns3::TcpGeneralTest.
Definition at line 112 of file tcp-linux-reno-test.cc.
References ns3::TcpGeneralTest::ConfigureProperties(), m_delayedAck, m_initialCwnd, m_segmentSize, ns3::TcpGeneralTest::RECEIVER, ns3::TcpGeneralTest::SENDER, ns3::TcpGeneralTest::SetDelAckMaxCount(), ns3::TcpGeneralTest::SetInitialCwnd(), and ns3::TcpGeneralTest::SetSegmentSize().
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overrideprotectedvirtual |
Tracks the congestion window changes.
oldValue | old value |
newValue | new value |
Reimplemented from ns3::TcpGeneralTest.
Definition at line 134 of file tcp-linux-reno-test.cc.
References ns3::TcpGeneralTest::GetInitialSsThresh(), ns3::TcpGeneralTest::GetSegSize(), m_delayedAck, m_initial, m_initialCwnd, m_lastCwnd, m_segmentSize, NS_LOG_FUNCTION, NS_LOG_INFO, NS_TEST_ASSERT_MSG_EQ, NS_TEST_ASSERT_MSG_LT_OR_EQ, and ns3::TcpGeneralTest::SENDER.
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overrideprotectedvirtual |
Teardown the TCP test.
Reimplemented from ns3::TcpGeneralTest.
Definition at line 176 of file tcp-linux-reno-test.cc.
References ns3::TcpGeneralTest::DoTeardown(), m_expectedCwnd, m_lastCwnd, and NS_TEST_ASSERT_MSG_EQ.
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overrideprotectedvirtual |
Link drop.
who | where the drop occurred (SENDER or RECEIVER) |
Reimplemented from ns3::TcpGeneralTest.
Definition at line 128 of file tcp-linux-reno-test.cc.
References NS_FATAL_ERROR.
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overrideprotectedvirtual |
Drop on the queue.
who | where the drop occurred (SENDER or RECEIVER) |
Reimplemented from ns3::TcpGeneralTest.
Definition at line 122 of file tcp-linux-reno-test.cc.
References NS_FATAL_ERROR.
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overrideprivatevirtual |
Packet received from IP layer.
p | packet |
h | header |
who | the socket which has received the packet (SENDER or RECEIVER) |
Reimplemented from ns3::TcpGeneralTest.
Definition at line 170 of file tcp-linux-reno-test.cc.
References NS_LOG_FUNCTION.
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overrideprivatevirtual |
Packet transmitted down to IP layer.
p | packet |
h | header |
who | the socket which has received the packet (SENDER or RECEIVER) |
Reimplemented from ns3::TcpGeneralTest.
Definition at line 164 of file tcp-linux-reno-test.cc.
References NS_LOG_FUNCTION.
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private |
Delayed Acknowledgement.
Definition at line 76 of file tcp-linux-reno-test.cc.
Referenced by ConfigureProperties(), and CWndTrace().
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private |
Expected final cWnd value.
Definition at line 78 of file tcp-linux-reno-test.cc.
Referenced by DoTeardown().
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protected |
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private |
Initial congestion window.
Definition at line 75 of file tcp-linux-reno-test.cc.
Referenced by ConfigureProperties(), and CWndTrace().
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private |
Last cWnd value reported.
Definition at line 77 of file tcp-linux-reno-test.cc.
Referenced by CWndTrace(), and DoTeardown().
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private |
Packet counter.
Definition at line 74 of file tcp-linux-reno-test.cc.
Referenced by ConfigureEnvironment().
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private |
Packet size.
Definition at line 73 of file tcp-linux-reno-test.cc.
Referenced by ConfigureEnvironment().
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private |
Segment size.
Definition at line 72 of file tcp-linux-reno-test.cc.
Referenced by ConfigureProperties(), and CWndTrace().