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https://github.com/facebookincubator/mvfst.git
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c0a659a30a
Summary: Use the new Pacer interface in the transport where we currently directly use CongestinoController interrace for paciner related APIs. Reviewed By: mjoras Differential Revision: D16918672 fbshipit-source-id: 410f72d567e71bdd3279e344f6e9abf5e132518e
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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#include <quic/congestion_control/CongestionControlFunctions.h>
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#include <quic/QuicConstants.h>
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#include <quic/common/TimeUtil.h>
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#include <algorithm>
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namespace quic {
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uint64_t boundedCwnd(
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uint64_t cwndBytes,
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uint64_t packetLength,
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uint64_t maxCwndInMss,
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uint64_t minCwndInMss) noexcept {
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return std::max(
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std::min(cwndBytes, maxCwndInMss * packetLength),
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minCwndInMss * packetLength);
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}
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PacingRate calculatePacingRate(
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const QuicConnectionStateBase& conn,
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uint64_t cwnd,
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uint64_t minCwndInMss,
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std::chrono::microseconds rtt) {
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if (conn.transportSettings.pacingTimerTickInterval > rtt) {
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// We cannot really pace in this case.
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return PacingRate::Builder()
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.setInterval(0us)
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.setBurstSize(conn.transportSettings.writeConnectionDataPacketsLimit)
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.build();
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}
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uint64_t cwndInPackets = std::max(minCwndInMss, cwnd / conn.udpSendPacketLen);
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// Each interval we want to send cwndInpackets / (rtt / minimalInverval)
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// number of packets.
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uint64_t burstPerInterval = std::min(
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conn.transportSettings.maxBurstPackets,
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static_cast<uint64_t>(std::ceil(
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static_cast<double>(cwndInPackets) *
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static_cast<double>(
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conn.transportSettings.pacingTimerTickInterval.count()) /
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static_cast<double>(rtt.count()))));
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auto interval = timeMax(
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conn.transportSettings.pacingTimerTickInterval,
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rtt * burstPerInterval / cwndInPackets);
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return PacingRate::Builder()
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.setInterval(interval)
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.setBurstSize(burstPerInterval)
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.build();
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}
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} // namespace quic
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