Green-Sky/solanaceae_ngc_ft1
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rework time since reduction to only grow if cca is active, also start warm

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Green Sky 2024-05-27 11:59:32 +02:00
parent a4201f4407
commit 319e754aff
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2 changed files with 24 additions and 7 deletions
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25
solanaceae/ngc_ft1/cubic.cpp
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@ -3,14 +3,25 @@
#include <cmath>
#include <iostream>
void CUBIC::updateReductionTimer(float time_delta) {
const auto now {getTimeNow()};
// only keep updating while the cca interaction is not too long ago
if (now - _time_point_last_update <= getCurrentDelay()*2.f) {
_time_since_reduction += time_delta;
}
}
void CUBIC::resetReductionTimer(void) {
_time_since_reduction = 0.f;
}
float CUBIC::getCWnD(void) const {
const double K = cbrt(
(_window_max * (1. - BETA)) / SCALING_CONSTANT
);
const double time_since_reduction = getTimeNow() - _time_point_reduction;
const double TK = time_since_reduction - K;
const double TK = _time_since_reduction - K;
const double cwnd =
SCALING_CONSTANT
@ -34,13 +45,13 @@ float CUBIC::getCWnD(void) const {
void CUBIC::onCongestion(void) {
// 8 is probably too much (800ms for 100ms rtt)
if (getTimeNow() - _time_point_reduction >= getCurrentDelay()*4.f) {
const auto tmp_old_tp = getTimeNow() - _time_point_reduction;
if (_time_since_reduction >= getCurrentDelay()*4.f) {
const auto tmp_old_tp = _time_since_reduction;
const auto current_cwnd = getCWnD(); // TODO: remove, only used by logging?
const auto current_wnd = getWindow(); // respects cwnd and fwnd
_time_point_reduction = getTimeNow();
resetReductionTimer();
if (current_cwnd < _window_max) {
// congestion before reaching the inflection point (prev window_max).
@ -72,6 +83,8 @@ float CUBIC::getWindow(void) {
int64_t CUBIC::canSend(float time_delta) {
const auto fspace_pkgs = FlowOnly::canSend(time_delta);
updateReductionTimer(time_delta);
if (fspace_pkgs == 0u) {
return 0u;
}

6
solanaceae/ngc_ft1/cubic.hpp
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@ -17,9 +17,13 @@ struct CUBIC : public FlowOnly {
// window size before last reduciton
double _window_max {2.f * MAXIMUM_SEGMENT_SIZE}; // start with mss*2
//double _window_last_max {2.f * MAXIMUM_SEGMENT_SIZE};
double _time_point_reduction {getTimeNow()};
double _time_since_reduction {12.f}; // warm start
private:
void updateReductionTimer(float time_delta);
void resetReductionTimer(void);
float getCWnD(void) const;
// moving avg over the last few delay samples