238 lines
8.7 KiB
C++
238 lines
8.7 KiB
C++
/*
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* Copyright (c) 2015 Universita' degli Studi di Napoli "Federico II"
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Pasquale Imputato <p.imputato@gmail.com>
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* Author: Stefano Avallone <stefano.avallone@unina.it>
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*/
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#include "ns3/applications-module.h"
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#include "ns3/core-module.h"
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#include "ns3/flow-monitor-module.h"
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#include "ns3/internet-module.h"
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#include "ns3/network-module.h"
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#include "ns3/point-to-point-module.h"
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#include "ns3/traffic-control-module.h"
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// This simple example shows how to use TrafficControlHelper to install a
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// QueueDisc on a device.
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//
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// The default QueueDisc is a pfifo_fast with a capacity of 1000 packets (as in
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// Linux). However, in this example, we install a RedQueueDisc with a capacity
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// of 10000 packets.
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//
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// Network topology
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//
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// 10.1.1.0
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// n0 -------------- n1
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// point-to-point
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//
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// The output will consist of all the traced changes in the length of the RED
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// internal queue and in the length of the netdevice queue:
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//
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// DevicePacketsInQueue 0 to 1
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// TcPacketsInQueue 7 to 8
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// TcPacketsInQueue 8 to 9
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// DevicePacketsInQueue 1 to 0
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// TcPacketsInQueue 9 to 8
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//
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// plus some statistics collected at the network layer (by the flow monitor)
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// and the application layer. Finally, the number of packets dropped by the
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// queuing discipline, the number of packets dropped by the netdevice and
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// the number of packets requeued by the queuing discipline are reported.
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//
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// If the size of the DropTail queue of the netdevice were increased from 1
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// to a large number (e.g. 1000), one would observe that the number of dropped
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// packets goes to zero, but the latency grows in an uncontrolled manner. This
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// is the so-called bufferbloat problem, and illustrates the importance of
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// having a small device queue, so that the standing queues build in the traffic
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// control layer where they can be managed by advanced queue discs rather than
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// in the device layer.
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE("TrafficControlExample");
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/**
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* Number of packets in TX queue trace.
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*
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* \param oldValue Old velue.
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* \param newValue New value.
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*/
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void
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TcPacketsInQueueTrace(uint32_t oldValue, uint32_t newValue)
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{
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std::cout << "TcPacketsInQueue " << oldValue << " to " << newValue << std::endl;
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}
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/**
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* Packets in the device queue trace.
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*
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* \param oldValue Old velue.
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* \param newValue New value.
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*/
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void
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DevicePacketsInQueueTrace(uint32_t oldValue, uint32_t newValue)
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{
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std::cout << "DevicePacketsInQueue " << oldValue << " to " << newValue << std::endl;
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}
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/**
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* TC Soujoun time trace.
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*
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* \param sojournTime The soujourn time.
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*/
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void
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SojournTimeTrace(Time sojournTime)
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{
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std::cout << "Sojourn time " << sojournTime.ToDouble(Time::MS) << "ms" << std::endl;
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}
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int
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main(int argc, char* argv[])
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{
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double simulationTime = 10; // seconds
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std::string transportProt = "Tcp";
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std::string socketType;
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CommandLine cmd(__FILE__);
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cmd.AddValue("transportProt", "Transport protocol to use: Tcp, Udp", transportProt);
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cmd.Parse(argc, argv);
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if (transportProt == "Tcp")
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{
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socketType = "ns3::TcpSocketFactory";
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}
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else
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{
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socketType = "ns3::UdpSocketFactory";
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}
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NodeContainer nodes;
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nodes.Create(2);
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PointToPointHelper pointToPoint;
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pointToPoint.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
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pointToPoint.SetChannelAttribute("Delay", StringValue("2ms"));
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pointToPoint.SetQueue("ns3::DropTailQueue", "MaxSize", StringValue("1p"));
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NetDeviceContainer devices;
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devices = pointToPoint.Install(nodes);
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InternetStackHelper stack;
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stack.Install(nodes);
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TrafficControlHelper tch;
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tch.SetRootQueueDisc("ns3::RedQueueDisc");
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QueueDiscContainer qdiscs = tch.Install(devices);
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Ptr<QueueDisc> q = qdiscs.Get(1);
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q->TraceConnectWithoutContext("PacketsInQueue", MakeCallback(&TcPacketsInQueueTrace));
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Config::ConnectWithoutContext(
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"/NodeList/1/$ns3::TrafficControlLayer/RootQueueDiscList/0/SojournTime",
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MakeCallback(&SojournTimeTrace));
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Ptr<NetDevice> nd = devices.Get(1);
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Ptr<PointToPointNetDevice> ptpnd = DynamicCast<PointToPointNetDevice>(nd);
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Ptr<Queue<Packet>> queue = ptpnd->GetQueue();
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queue->TraceConnectWithoutContext("PacketsInQueue", MakeCallback(&DevicePacketsInQueueTrace));
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Ipv4AddressHelper address;
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address.SetBase("10.1.1.0", "255.255.255.0");
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Ipv4InterfaceContainer interfaces = address.Assign(devices);
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// Flow
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uint16_t port = 7;
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Address localAddress(InetSocketAddress(Ipv4Address::GetAny(), port));
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PacketSinkHelper packetSinkHelper(socketType, localAddress);
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ApplicationContainer sinkApp = packetSinkHelper.Install(nodes.Get(0));
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sinkApp.Start(Seconds(0.0));
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sinkApp.Stop(Seconds(simulationTime + 0.1));
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uint32_t payloadSize = 1448;
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Config::SetDefault("ns3::TcpSocket::SegmentSize", UintegerValue(payloadSize));
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OnOffHelper onoff(socketType, Ipv4Address::GetAny());
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onoff.SetAttribute("OnTime", StringValue("ns3::ConstantRandomVariable[Constant=1]"));
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onoff.SetAttribute("OffTime", StringValue("ns3::ConstantRandomVariable[Constant=0]"));
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onoff.SetAttribute("PacketSize", UintegerValue(payloadSize));
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onoff.SetAttribute("DataRate", StringValue("50Mbps")); // bit/s
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ApplicationContainer apps;
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InetSocketAddress rmt(interfaces.GetAddress(0), port);
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onoff.SetAttribute("Remote", AddressValue(rmt));
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onoff.SetAttribute("Tos", UintegerValue(0xb8));
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apps.Add(onoff.Install(nodes.Get(1)));
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apps.Start(Seconds(1.0));
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apps.Stop(Seconds(simulationTime + 0.1));
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FlowMonitorHelper flowmon;
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Ptr<FlowMonitor> monitor = flowmon.InstallAll();
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Simulator::Stop(Seconds(simulationTime + 5));
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Simulator::Run();
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Ptr<Ipv4FlowClassifier> classifier = DynamicCast<Ipv4FlowClassifier>(flowmon.GetClassifier());
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std::map<FlowId, FlowMonitor::FlowStats> stats = monitor->GetFlowStats();
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std::cout << std::endl << "*** Flow monitor statistics ***" << std::endl;
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std::cout << " Tx Packets/Bytes: " << stats[1].txPackets << " / " << stats[1].txBytes
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<< std::endl;
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std::cout << " Offered Load: "
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<< stats[1].txBytes * 8.0 /
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(stats[1].timeLastTxPacket.GetSeconds() -
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stats[1].timeFirstTxPacket.GetSeconds()) /
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1000000
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<< " Mbps" << std::endl;
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std::cout << " Rx Packets/Bytes: " << stats[1].rxPackets << " / " << stats[1].rxBytes
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<< std::endl;
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uint32_t packetsDroppedByQueueDisc = 0;
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uint64_t bytesDroppedByQueueDisc = 0;
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if (stats[1].packetsDropped.size() > Ipv4FlowProbe::DROP_QUEUE_DISC)
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{
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packetsDroppedByQueueDisc = stats[1].packetsDropped[Ipv4FlowProbe::DROP_QUEUE_DISC];
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bytesDroppedByQueueDisc = stats[1].bytesDropped[Ipv4FlowProbe::DROP_QUEUE_DISC];
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}
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std::cout << " Packets/Bytes Dropped by Queue Disc: " << packetsDroppedByQueueDisc << " / "
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<< bytesDroppedByQueueDisc << std::endl;
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uint32_t packetsDroppedByNetDevice = 0;
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uint64_t bytesDroppedByNetDevice = 0;
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if (stats[1].packetsDropped.size() > Ipv4FlowProbe::DROP_QUEUE)
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{
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packetsDroppedByNetDevice = stats[1].packetsDropped[Ipv4FlowProbe::DROP_QUEUE];
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bytesDroppedByNetDevice = stats[1].bytesDropped[Ipv4FlowProbe::DROP_QUEUE];
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}
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std::cout << " Packets/Bytes Dropped by NetDevice: " << packetsDroppedByNetDevice << " / "
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<< bytesDroppedByNetDevice << std::endl;
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std::cout << " Throughput: "
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<< stats[1].rxBytes * 8.0 /
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(stats[1].timeLastRxPacket.GetSeconds() -
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stats[1].timeFirstRxPacket.GetSeconds()) /
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1000000
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<< " Mbps" << std::endl;
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std::cout << " Mean delay: " << stats[1].delaySum.GetSeconds() / stats[1].rxPackets
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<< std::endl;
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std::cout << " Mean jitter: " << stats[1].jitterSum.GetSeconds() / (stats[1].rxPackets - 1)
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<< std::endl;
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auto dscpVec = classifier->GetDscpCounts(1);
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for (auto p : dscpVec)
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{
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std::cout << " DSCP value: 0x" << std::hex << static_cast<uint32_t>(p.first) << std::dec
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<< " count: " << p.second << std::endl;
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}
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Simulator::Destroy();
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std::cout << std::endl << "*** Application statistics ***" << std::endl;
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double thr = 0;
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uint64_t totalPacketsThr = DynamicCast<PacketSink>(sinkApp.Get(0))->GetTotalRx();
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thr = totalPacketsThr * 8 / (simulationTime * 1000000.0); // Mbit/s
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std::cout << " Rx Bytes: " << totalPacketsThr << std::endl;
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std::cout << " Average Goodput: " << thr << " Mbit/s" << std::endl;
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std::cout << std::endl << "*** TC Layer statistics ***" << std::endl;
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std::cout << q->GetStats() << std::endl;
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return 0;
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}
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