/* -*- 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
* Author: Stefano Avallone
*/
#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;
}
void
SojournTimeTrace (Time sojournTime)
{
std::cout << "Sojourn time " << sojournTime.ToDouble (Time::MS) << "ms" << std::endl;
}
int
main (int argc, char *argv[])
{
double simulationTime = 10; //seconds
std::string transportProt = "Tcp";
std::string socketType;
CommandLine cmd (__FILE__);
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", "MaxSize", StringValue ("1p"));
NetDeviceContainer devices;
devices = pointToPoint.Install (nodes);
InternetStackHelper stack;
stack.Install (nodes);
TrafficControlHelper tch;
tch.SetRootQueueDisc ("ns3::RedQueueDisc");
QueueDiscContainer qdiscs = tch.Install (devices);
Ptr q = qdiscs.Get (1);
q->TraceConnectWithoutContext ("PacketsInQueue", MakeCallback (&TcPacketsInQueueTrace));
Config::ConnectWithoutContext ("/NodeList/1/$ns3::TrafficControlLayer/RootQueueDiscList/0/SojournTime",
MakeCallback (&SojournTimeTrace));
Ptr nd = devices.Get (1);
Ptr ptpnd = DynamicCast (nd);
Ptr > 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;
InetSocketAddress rmt (interfaces.GetAddress (0), port);
rmt.SetTos (0xb8);
AddressValue remoteAddress (rmt);
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 monitor = flowmon.InstallAll();
Simulator::Stop (Seconds (simulationTime + 5));
Simulator::Run ();
Ptr classifier = DynamicCast (flowmon.GetClassifier ());
std::map stats = monitor->GetFlowStats ();
std::cout << std::endl << "*** Flow monitor statistics ***" << std::endl;
std::cout << " Tx Packets/Bytes: " << stats[1].txPackets
<< " / " << 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/Bytes: " << stats[1].rxPackets
<< " / " << stats[1].rxBytes << std::endl;
uint32_t packetsDroppedByQueueDisc = 0;
uint64_t bytesDroppedByQueueDisc = 0;
if (stats[1].packetsDropped.size () > Ipv4FlowProbe::DROP_QUEUE_DISC)
{
packetsDroppedByQueueDisc = stats[1].packetsDropped[Ipv4FlowProbe::DROP_QUEUE_DISC];
bytesDroppedByQueueDisc = stats[1].bytesDropped[Ipv4FlowProbe::DROP_QUEUE_DISC];
}
std::cout << " Packets/Bytes Dropped by Queue Disc: " << packetsDroppedByQueueDisc
<< " / " << bytesDroppedByQueueDisc << std::endl;
uint32_t packetsDroppedByNetDevice = 0;
uint64_t bytesDroppedByNetDevice = 0;
if (stats[1].packetsDropped.size () > Ipv4FlowProbe::DROP_QUEUE)
{
packetsDroppedByNetDevice = stats[1].packetsDropped[Ipv4FlowProbe::DROP_QUEUE];
bytesDroppedByNetDevice = stats[1].bytesDropped[Ipv4FlowProbe::DROP_QUEUE];
}
std::cout << " Packets/Bytes Dropped by NetDevice: " << packetsDroppedByNetDevice
<< " / " << bytesDroppedByNetDevice << 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;
auto dscpVec = classifier->GetDscpCounts (1);
for (auto p : dscpVec)
{
std::cout << " DSCP value: 0x" << std::hex << static_cast (p.first) << std::dec
<< " count: "<< p.second << std::endl;
}
Simulator::Destroy ();
std::cout << std::endl << "*** Application statistics ***" << std::endl;
double thr = 0;
uint64_t totalPacketsThr = DynamicCast (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 << q->GetStats () << std::endl;
return 0;
}