mirror of
https://github.com/ton-blockchain/ton
synced 2025-02-12 19:22:37 +00:00
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2020 Telegram Systems LLP
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*/
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#include "Bbr.h"
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#include "BdwStats.h"
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#include "RttStats.h"
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#include "td/utils/Random.h"
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namespace ton {
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namespace rldp2 {
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void Bbr::step(const RttStats &rtt_stats, const BdwStats &bdw_stats, td::uint64 in_flight, td::Timestamp now) {
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rtt_min_ = rtt_stats.windowed_min_rtt;
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bdw_max_ = bdw_stats.windowed_max_bdw;
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if (bdw_max_ > bdw_peak_ * 1.25) {
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bdw_peak_ = bdw_max_;
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bdw_peak_at_round = rtt_stats.rtt_round;
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//LOG(ERROR) << "NEW PEAK " << bdw_peak_ * 768;
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}
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if (state_ == State::Start && bdw_peak_at_round + 3 < rtt_stats.rtt_round) {
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//LOG(ERROR) << "START -> DRAIN";
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state_ = State::Drain;
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}
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if (state_ == State::Drain && (double)in_flight < bdw_max_ * rtt_min_) {
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//LOG(ERROR) << "DRAIN -> BPROBE BDW";
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state_ = State::ProbeBdw;
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probe_bdw_cycle_ = td::Random::fast(1, 5);
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probe_bdw_cycle_at_ = now;
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}
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if (state_ == State::ProbeBdw && td::Timestamp::in(rtt_stats.windowed_min_rtt, probe_bdw_cycle_at_).is_in_past(now)) {
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probe_bdw_cycle_at_ = now;
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probe_bdw_cycle_ = (probe_bdw_cycle_ + 1) % 6;
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//LOG(ERROR) << "NEW PROBE BDW CYCLE";
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}
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//TODO: ProbeRtt state. Don't want to implenent now without proper tests
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}
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double Bbr::get_rate() const {
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if (state_ == State::Start) {
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return bdw_max_ * 2.8;
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}
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if (state_ == State::Drain) {
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return bdw_max_ / 2.8;
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}
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if (state_ == State::ProbeBdw) {
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constexpr double probe_bdw_gain[6] = {0.75, 1, 1, 1, 1, 1.25};
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return probe_bdw_gain[probe_bdw_cycle_] * bdw_max_;
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}
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UNREACHABLE();
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}
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td::uint32 Bbr::get_window_size() const {
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if (state_ == State::Start || state_ == State::Drain) {
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return td::max(td::uint32(bdw_max_ * rtt_min_ * 2.8 + 1), 10u);
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}
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return td::max(td::uint32(bdw_max_ * rtt_min_ * 2 + 1), 10u);
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}
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} // namespace rldp2
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} // namespace ton
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