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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2015 Universita' degli Studi di Napoli "Federico II"
*
* 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
*
* Author: Pasquale Imputato <p.imputato@gmail.com>
* Author: Stefano Avallone <stefano.avallone@unina.it>
*/
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/internet-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/applications-module.h"
#include "ns3/traffic-control-module.h"
#include "ns3/flow-monitor-module.h"
// This simple example shows how to use TrafficControlHelper to install a
// QueueDisc on a device.
//
// The default QueueDisc is a pfifo_fast with a capacity of 1000 packets (as in
// Linux). However, in this example, we install a RedQueueDisc with a capacity
// of 10000 packets.
//
// Network topology
//
// 10.1.1.0
// n0 -------------- n1
// point-to-point
//
// The output will consist of all the traced changes in the length of the RED
// internal queue and in the length of the netdevice queue:
//
// DevicePacketsInQueue 0 to 1
// TcPacketsInQueue 7 to 8
// TcPacketsInQueue 8 to 9
// DevicePacketsInQueue 1 to 0
// TcPacketsInQueue 9 to 8
//
// plus some statistics collected at the network layer (by the flow monitor)
// and the application layer. Finally, the number of packets dropped by the
// queuing discipline, the number of packets dropped by the netdevice and
// the number of packets requeued by the queuing discipline are reported.
//
// If the size of the DropTail queue of the netdevice were increased from 1
// to a large number (e.g. 1000), one would observe that the number of dropped
// packets goes to zero, but the latency grows in an uncontrolled manner. This
// is the so-called bufferbloat problem, and illustrates the importance of
// having a small device queue, so that the standing queues build in the traffic
// control layer where they can be managed by advanced queue discs rather than
// in the device layer.
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("TrafficControlExample");
void
TcPacketsInQueueTrace (uint32_t oldValue, uint32_t newValue)
{
std::cout << "TcPacketsInQueue " << oldValue << " to " << newValue << std::endl;
}
void
DevicePacketsInQueueTrace (uint32_t oldValue, uint32_t newValue)
{
std::cout << "DevicePacketsInQueue " << oldValue << " to " << newValue << std::endl;
}
int
main (int argc, char *argv[])
{
double simulationTime = 10; //seconds
std::string transportProt = "Tcp";
std::string socketType;
CommandLine cmd;
cmd.AddValue ("transportProt", "Transport protocol to use: Tcp, Udp", transportProt);
cmd.Parse (argc, argv);
if (transportProt.compare ("Tcp") == 0)
{
socketType = "ns3::TcpSocketFactory";
}
else
{
socketType = "ns3::UdpSocketFactory";
}
NodeContainer nodes;
nodes.Create (2);
PointToPointHelper pointToPoint;
pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("10Mbps"));
pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
pointToPoint.SetQueue ("ns3::DropTailQueue", "Mode", StringValue ("QUEUE_MODE_PACKETS"), "MaxPackets", UintegerValue (1));
NetDeviceContainer devices;
devices = pointToPoint.Install (nodes);
InternetStackHelper stack;
stack.Install (nodes);
TrafficControlHelper tch;
uint16_t handle = tch.SetRootQueueDisc ("ns3::RedQueueDisc");
// Add the internal queue used by Red
tch.AddInternalQueues (handle, 1, "ns3::DropTailQueue", "MaxPackets", UintegerValue (10000));
QueueDiscContainer qdiscs = tch.Install (devices);
Ptr<QueueDisc> q = qdiscs.Get (1);
q->TraceConnectWithoutContext ("PacketsInQueue", MakeCallback (&TcPacketsInQueueTrace));
// Alternatively:
// Config::ConnectWithoutContext ("/NodeList/1/$ns3::TrafficControlLayer/RootQueueDiscList/0/PacketsInQueue",
// MakeCallback (&TcPacketsInQueueTrace));
Ptr<NetDevice> nd = devices.Get (1);
Ptr<PointToPointNetDevice> ptpnd = DynamicCast<PointToPointNetDevice> (nd);
Ptr<Queue> queue = ptpnd->GetQueue ();
queue->TraceConnectWithoutContext ("PacketsInQueue", MakeCallback (&DevicePacketsInQueueTrace));
Ipv4AddressHelper address;
address.SetBase ("10.1.1.0", "255.255.255.0");
Ipv4InterfaceContainer interfaces = address.Assign (devices);
//Flow
uint16_t port = 7;
Address localAddress (InetSocketAddress (Ipv4Address::GetAny (), port));
PacketSinkHelper packetSinkHelper (socketType, localAddress);
ApplicationContainer sinkApp = packetSinkHelper.Install (nodes.Get (0));
sinkApp.Start (Seconds (0.0));
sinkApp.Stop (Seconds (simulationTime + 0.1));
uint32_t payloadSize = 1448;
Config::SetDefault ("ns3::TcpSocket::SegmentSize", UintegerValue (payloadSize));
OnOffHelper onoff (socketType, Ipv4Address::GetAny ());
onoff.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
onoff.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));
onoff.SetAttribute ("PacketSize", UintegerValue (payloadSize));
onoff.SetAttribute ("DataRate", StringValue ("50Mbps")); //bit/s
ApplicationContainer apps;
AddressValue remoteAddress (InetSocketAddress (interfaces.GetAddress (0), port));
onoff.SetAttribute ("Remote", remoteAddress);
apps.Add (onoff.Install (nodes.Get (1)));
apps.Start (Seconds (1.0));
apps.Stop (Seconds (simulationTime + 0.1));
FlowMonitorHelper flowmon;
Ptr<FlowMonitor> monitor = flowmon.InstallAll();
Simulator::Stop (Seconds (simulationTime + 5));
Simulator::Run ();
Ptr<Ipv4FlowClassifier> classifier = DynamicCast<Ipv4FlowClassifier> (flowmon.GetClassifier ());
std::map<FlowId, FlowMonitor::FlowStats> stats = monitor->GetFlowStats ();
std::cout << std::endl << "*** Flow monitor statistics ***" << std::endl;
std::cout << " Tx Packets: " << stats[1].txPackets << std::endl;
std::cout << " Tx Bytes: " << stats[1].txBytes << std::endl;
std::cout << " Offered Load: " << stats[1].txBytes * 8.0 / (stats[1].timeLastTxPacket.GetSeconds () - stats[1].timeFirstTxPacket.GetSeconds ()) / 1000000 << " Mbps" << std::endl;
std::cout << " Rx Packets: " << stats[1].rxPackets << std::endl;
std::cout << " Rx Bytes: " << stats[1].rxBytes << std::endl;
std::cout << " Packets Dropped by Queue Disc: " << stats[1].packetsDropped[Ipv4FlowProbe::DROP_QUEUE_DISC] << std::endl;
std::cout << " Bytes Dropped by Queue Disc: " << stats[1].bytesDropped[Ipv4FlowProbe::DROP_QUEUE_DISC] << std::endl;
std::cout << " Packets Dropped by NetDevice: " << stats[1].packetsDropped[Ipv4FlowProbe::DROP_QUEUE] << std::endl;
std::cout << " Bytes Dropped by NetDevice: " << stats[1].bytesDropped[Ipv4FlowProbe::DROP_QUEUE] << std::endl;
std::cout << " Throughput: " << stats[1].rxBytes * 8.0 / (stats[1].timeLastRxPacket.GetSeconds () - stats[1].timeFirstRxPacket.GetSeconds ()) / 1000000 << " Mbps" << std::endl;
std::cout << " Mean delay: " << stats[1].delaySum.GetSeconds () / stats[1].rxPackets << std::endl;
std::cout << " Mean jitter: " << stats[1].jitterSum.GetSeconds () / (stats[1].rxPackets - 1) << std::endl;
Simulator::Destroy ();
std::cout << std::endl << "*** Application statistics ***" << std::endl;
double thr = 0;
uint32_t totalPacketsThr = DynamicCast<PacketSink> (sinkApp.Get (0))->GetTotalRx ();
thr = totalPacketsThr * 8 / (simulationTime * 1000000.0); //Mbit/s
std::cout << " Rx Bytes: " << totalPacketsThr << std::endl;
std::cout << " Average Goodput: " << thr << " Mbit/s" << std::endl;
std::cout << std::endl << "*** TC Layer statistics ***" << std::endl;
std::cout << " Packets dropped by the TC layer: " << q->GetTotalDroppedPackets () << std::endl;
std::cout << " Bytes dropped by the TC layer: " << q->GetTotalDroppedBytes () << std::endl;
std::cout << " Packets dropped by the netdevice: " << queue->GetTotalDroppedPackets () << std::endl;
std::cout << " Packets requeued by the TC layer: " << q->GetTotalRequeuedPackets () << std::endl;
return 0;
}
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