/*
* 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/applications-module.h"
#include "ns3/core-module.h"
#include "ns3/flow-monitor-module.h"
#include "ns3/internet-module.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/traffic-control-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");
/**
* Number of packets in TX queue trace.
*
* \param oldValue Old velue.
* \param newValue New value.
*/
void
TcPacketsInQueueTrace(uint32_t oldValue, uint32_t newValue)
{
std::cout << "TcPacketsInQueue " << oldValue << " to " << newValue << std::endl;
}
/**
* Packets in the device queue trace.
*
* \param oldValue Old velue.
* \param newValue New value.
*/
void
DevicePacketsInQueueTrace(uint32_t oldValue, uint32_t newValue)
{
std::cout << "DevicePacketsInQueue " << oldValue << " to " << newValue << std::endl;
}
/**
* TC Soujoun time trace.
*
* \param sojournTime The soujourn time.
*/
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 == "Tcp")
{
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;
}