/usr/include/ns3.27/ns3/tcp-scalable.h is in libns3-dev 3.27+dfsg-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2016 ResiliNets, ITTC, University of Kansas
*
* 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
*
* Authors: Truc Anh N. Nguyen <annguyen@ittc.ku.edu>
* Keerthi Ganta <keerthig@ittc.ku.edu>
* Md Moshfequr Rahman <moshfequr@ittc.ku.edu>
* Amir Modarresi <amodarresi@ittc.ku.edu>
*
* James P.G. Sterbenz <jpgs@ittc.ku.edu>, director
* ResiliNets Research Group http://wiki.ittc.ku.edu/resilinets
* Information and Telecommunication Technology Center (ITTC)
* and Department of Electrical Engineering and Computer Science
* The University of Kansas Lawrence, KS USA.
*/
#ifndef TCPSCALABLE_H
#define TCPSCALABLE_H
#include "ns3/tcp-congestion-ops.h"
namespace ns3 {
/**
* \ingroup congestionOps
*
* \brief An implementation of TCP Scalable
*
* Scalable improves TCP performance to better utilize the available bandwidth
* of a highspeed wide area network by altering NewReno congestion window
* adjustment algorithm.
*
* When congestion has not been detected, for each ACK received in an RTT,
* Scalable increases its cwnd per:
*
* cwnd = cwnd + 0.01 (1)
*
* Following Linux implementation of Scalable, we use 50 instead of 100 to
* account for delayed ACK.
*
* On the first detection of congestion in a given RTT, cwnd is reduced based
* on the following equation:
*
* cwnd = cwnd - ceil(0.125 * cwnd) (2)
*
* More information: http://doi.acm.org/10.1145/956981.956989
*/
class TcpScalable : public TcpNewReno
{
public:
/**
* \brief Get the type ID.
* \return the object TypeId
*/
static TypeId GetTypeId (void);
/**
* Create an unbound tcp socket.
*/
TcpScalable (void);
/**
* \brief Copy constructor
* \param sock the object to copy
*/
TcpScalable (const TcpScalable& sock);
virtual ~TcpScalable (void);
virtual std::string GetName () const;
/**
* \brief Get slow start threshold following Scalable principle (Equation 2)
*
* \param tcb internal congestion state
* \param bytesInFlight bytes in flight
*
* \return the slow start threshold value
*/
virtual uint32_t GetSsThresh (Ptr<const TcpSocketState> tcb,
uint32_t bytesInFlight);
virtual Ptr<TcpCongestionOps> Fork ();
protected:
/**
* \brief Congestion avoidance of TcpScalable (Equation 1)
*
* \param tcb internal congestion state
* \param segmentsAcked count of segments acked
*/
virtual void CongestionAvoidance (Ptr<TcpSocketState> tcb,
uint32_t segmentsAcked);
private:
uint32_t m_ackCnt; //!< Number of received ACK
uint32_t m_aiFactor; //!< Additive increase factor
double m_mdFactor; //!< Multiplicative decrease factor
};
} // namespace ns3
#endif // TCPSCALABLE_H
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