Eric Newberry
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/**
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* Copyright (c) 2014-2017, Regents of the University of California,
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* Arizona Board of Regents,
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* Colorado State University,
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* University Pierre & Marie Curie, Sorbonne University,
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* Washington University in St. Louis,
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* Beijing Institute of Technology,
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* The University of Memphis.
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*
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* This file is part of NFD (Named Data Networking Forwarding Daemon).
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* See AUTHORS.md for complete list of NFD authors and contributors.
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*
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* NFD is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef NFD_CORE_RTT_ESTIMATOR_HPP
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#define NFD_CORE_RTT_ESTIMATOR_HPP
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#include "core/common.hpp"
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namespace nfd {
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/**
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* \brief implements the Mean-Deviation RTT estimator
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*
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* reference: ns3::RttMeanDeviation
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*
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* This RttEstimator algorithm is designed for TCP, which is a continuous stream.
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* NDN Interest-Data traffic is not always a continuous stream,
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* so NDN may need a different RttEstimator.
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* The design of a more suitable RttEstimator is a research question.
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*/
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class RttEstimator
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{
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public:
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typedef time::microseconds Duration;
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static Duration
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getInitialRtt(void)
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{
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return time::seconds(1);
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}
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RttEstimator(uint16_t maxMultiplier = 16,
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Duration minRto = time::milliseconds(1),
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double gain = 0.1);
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void
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addMeasurement(Duration measure);
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void
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incrementMultiplier();
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void
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doubleMultiplier();
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Duration
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computeRto() const;
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private:
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uint16_t m_maxMultiplier;
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double m_minRto;
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double m_rtt;
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double m_gain;
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double m_variance;
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uint16_t m_multiplier;
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uint32_t m_nSamples;
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};
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} // namespace nfd
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#endif // NFD_CORE_RTT_ESTIMATOR_HPP
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