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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <hicn/transport/interfaces/socket_options_default_values.h>
#include <hicn/transport/protocols/vegas_rto_estimator.h>
#include <algorithm>
#include <cmath>
namespace transport {
namespace protocol {
using namespace interface;
RtoEstimator::RtoEstimator(Duration min_rto)
: smoothed_rtt_((double)RtoEstimator::getInitialRtt().count()),
rtt_variation_(0),
first_measurement_(true),
last_rto_((double)min_rto.count()) {}
void RtoEstimator::addMeasurement(Duration rtt) {
double duration = static_cast<double>(rtt.count());
if (first_measurement_) {
smoothed_rtt_ = duration;
rtt_variation_ = duration / 2;
first_measurement_ = false;
} else {
rtt_variation_ = (1 - default_values::beta) * rtt_variation_ +
default_values::beta * std::abs(smoothed_rtt_ - duration);
smoothed_rtt_ = (1 - default_values::alpha) * smoothed_rtt_ +
default_values::alpha * duration;
}
}
RtoEstimator::Duration RtoEstimator::computeRto() const {
double rto = smoothed_rtt_ +
std::max(double(default_values::clock_granularity.count()),
default_values::k* rtt_variation_);
return Duration(static_cast<Duration::rep>(rto));
}
} // end namespace protocol
} // end namespace transport
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