m_noDelay (sock.m_noDelay),

void

NscTcpSocketImpl::SetTcpNoDelay (bool noDelay)

{

  m_noDelay = noDelay;

}

bool

NscTcpSocketImpl::GetTcpNoDelay (void) const

{

  return m_noDelay;

}

  virtual void SetTcpNoDelay (bool noDelay);

  virtual bool GetTcpNoDelay (void) const;

  bool m_noDelay;

    m_noDelay (sock.m_noDelay),

      // Nagle's algorithm. If enabled, hold off sending if there is unacked 

      // data in the buffer and the amount of data to send is less than a 

      // segment size

      if (!m_noDelay)

        {

          if (UnAckDataCount () > 0 && 

              m_txBuffer.SizeFromSequence (m_nextTxSequence) < m_segmentSize)

            {

              NS_LOG_LOGIC ("Invoking Nagle's algorithm. Wait to send.");

              break;

            }

        }

TcpSocketBase::SetTcpNoDelay (bool noDelay)

{

  m_noDelay = noDelay;

}

bool

TcpSocketBase::GetTcpNoDelay (void) const

{

  return m_noDelay;

}

void

  virtual void     SetTcpNoDelay (bool noDelay);

  virtual bool     GetTcpNoDelay (void) const;

  bool              m_noDelay;         //< Set true to disable Nagle's algorithm

#include "ns3/boolean.h"

    .AddAttribute ("TcpNoDelay", "Set true to disable Nagle's algorithm",

                   BooleanValue (false),

                   MakeBooleanAccessor (&TcpSocket::GetTcpNoDelay,

                                        &TcpSocket::SetTcpNoDelay),

                   MakeBooleanChecker ())

  virtual void SetTcpNoDelay (bool noDelay) = 0;

  virtual bool GetTcpNoDelay (void) const = 0;

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include "ns3/log.h"

#include "ns3/abort.h"

#include "ns3/test.h"

#include "ns3/pcap-file.h"

#include "ns3/config.h"

#include "ns3/string.h"

#include "ns3/uinteger.h"

#include "ns3/boolean.h"

#include "ns3/data-rate.h"

#include "ns3/inet-socket-address.h"

#include "ns3/point-to-point-helper.h"

#include "ns3/csma-helper.h"

#include "ns3/internet-stack-helper.h"

#include "ns3/ipv4-global-routing-helper.h"

#include "ns3/ipv4-address-helper.h"

#include "ns3/packet-sink-helper.h"

#include "ns3/tcp-socket-factory.h"

#include "ns3/node-container.h"

#include "ns3/simulator.h"

#include "ns3tcp-socket-writer.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("Ns3TcpNoDelayTest");

// ===========================================================================

// Tests of Nagle's algorithm and the TCP no delay option

// ===========================================================================

//

//

class Ns3TcpNoDelayTestCase : public TestCase

{

public:

  Ns3TcpNoDelayTestCase (bool noDelay);

  virtual ~Ns3TcpNoDelayTestCase () {}

private:

  virtual void DoRun (void);

  bool m_noDelay;

  bool m_writeResults;

  void SinkRx (std::string path, Ptr<const Packet> p, const Address &address);

  TestVectors<uint32_t> m_inputs;

  TestVectors<uint32_t> m_responses;

};

Ns3TcpNoDelayTestCase::Ns3TcpNoDelayTestCase (bool noDelay)

  : TestCase ("Check that ns-3 TCP Nagle's algorithm works correctly and that we can turn it off."),

    m_noDelay (noDelay),

    m_writeResults (false)

{

}

void 

Ns3TcpNoDelayTestCase::SinkRx (std::string path, Ptr<const Packet> p, const Address &address)

{

  m_responses.Add (p->GetSize ());

}

void

Ns3TcpNoDelayTestCase::DoRun (void)

{

  uint16_t sinkPort = 50000;

  double sinkStopTime = 8;  // sec; will trigger Socket::Close

  double writerStopTime = 5;  // sec; will trigger Socket::Close

  double simStopTime = 10;  // sec

  Time sinkStopTimeObj = Seconds (sinkStopTime);

  Time writerStopTimeObj = Seconds (writerStopTime);

  Time simStopTimeObj= Seconds (simStopTime);

  Ptr<Node> n0 = CreateObject<Node> ();

  Ptr<Node> n1 = CreateObject<Node> ();

  PointToPointHelper pointToPoint;

  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

  NetDeviceContainer devices;

  devices = pointToPoint.Install (n0, n1);

  InternetStackHelper internet;

  internet.InstallAll ();

  Ipv4AddressHelper address;

  address.SetBase ("10.1.1.0", "255.255.255.252");

  Ipv4InterfaceContainer ifContainer = address.Assign (devices);

  Ptr<SocketWriter> socketWriter = CreateObject<SocketWriter> ();

  Address sinkAddress (InetSocketAddress (ifContainer.GetAddress (1), sinkPort));

  socketWriter->Setup (n0, sinkAddress);

  n0->AddApplication (socketWriter);

  socketWriter->SetStartTime (Seconds (0.));

  socketWriter->SetStopTime (writerStopTimeObj);

  PacketSinkHelper sink ("ns3::TcpSocketFactory",

                         InetSocketAddress (Ipv4Address::GetAny (), sinkPort));

  ApplicationContainer apps = sink.Install (n1);

  // Start the sink application at time zero, and stop it at sinkStopTime

  apps.Start (Seconds (0.0));

  apps.Stop (sinkStopTimeObj);

  Config::Connect ("/NodeList/*/ApplicationList/*/$ns3::PacketSink/Rx",

                   MakeCallback (&Ns3TcpNoDelayTestCase::SinkRx, this));

  // Enable or disable TCP no delay option

  Config::SetDefault ("ns3::TcpSocket::TcpNoDelay", BooleanValue (m_noDelay));

  // Connect the socket writer

  Simulator::Schedule (Seconds (1), &SocketWriter::Connect, socketWriter);

  // Write 5 packets to get some bytes in flight and some acks going

  Simulator::Schedule (Seconds (2), &SocketWriter::Write, socketWriter, 2680);

  m_inputs.Add (536);

  m_inputs.Add (536);

  m_inputs.Add (536);

  m_inputs.Add (536);

  m_inputs.Add (536);

  // Write one byte after 10 ms to ensure that some data is outstanding 

  // and the window is big enough

  Simulator::Schedule (Seconds (2.010), &SocketWriter::Write, socketWriter, 1);

  // If Nagle is not enabled, i.e. no delay is on, add an input for a 1-byte 

  // packet to be received

  if (m_noDelay)

    {

      m_inputs.Add (1);

    }

  // One ms later, write 535 bytes, i.e. one segment size - 1

  Simulator::Schedule (Seconds (2.012), &SocketWriter::Write, socketWriter, 535);

  // If Nagle is not enabled, add an input for a 535 byte packet,

  // otherwise, we should get a single "full" packet of 536 bytes

  if (m_noDelay)

    {

      m_inputs.Add (535);

    }

  else

    {

      m_inputs.Add (536);

    }

  // Close down the socket

  Simulator::Schedule (writerStopTimeObj, &SocketWriter::Close, socketWriter);

  if (m_writeResults)

    {

      std::ostringstream oss;

      if (m_noDelay)

        {

          oss << "tcp-no-delay-on-test-case";

          pointToPoint.EnablePcapAll (oss.str ());

        }

      else

        {

          oss << "tcp-no-delay-off-test-case";

          pointToPoint.EnablePcapAll (oss.str ());

        }

    }

  Simulator::Stop (simStopTimeObj);

  Simulator::Run ();

  Simulator::Destroy ();

  // Compare inputs and outputs

  NS_TEST_ASSERT_MSG_EQ (m_inputs.GetN (), m_responses.GetN (), "Incorrect number of expected receive events");

  for (uint32_t i = 0; i < m_responses.GetN (); i++)

    {

      uint32_t in = m_inputs.Get (i);

      uint32_t out = m_responses.Get (i);

      NS_TEST_ASSERT_MSG_EQ (in, out, "Mismatch:  expected " << in << " bytes, got " << out << " bytes");

    }

}

class Ns3TcpNoDelayTestSuite : public TestSuite

{

public:

  Ns3TcpNoDelayTestSuite ();

};

Ns3TcpNoDelayTestSuite::Ns3TcpNoDelayTestSuite ()

  : TestSuite ("ns3-tcp-no-delay", SYSTEM)

{

  AddTestCase (new Ns3TcpNoDelayTestCase (true));

  AddTestCase (new Ns3TcpNoDelayTestCase (false));

}

static Ns3TcpNoDelayTestSuite ns3TcpNoDelayTestSuite;

        'ns3tcp-no-delay-test-suite.cc',