mirror of
https://github.com/facebookincubator/mvfst.git
synced 2025-08-09 20:42:44 +03:00
2d00d56fbd
Summary: ^ Reviewed By: yangchi Differential Revision: D21956286 fbshipit-source-id: 305b879ad11df23aae8e0c3aac4645c0136b3012
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
*/
|
|
|
|
#include <quic/congestion_control/CongestionControlFunctions.h>
|
|
|
|
#include <quic/QuicConstants.h>
|
|
#include <quic/common/TimeUtil.h>
|
|
#include <algorithm>
|
|
|
|
namespace quic {
|
|
|
|
uint64_t boundedCwnd(
|
|
uint64_t cwndBytes,
|
|
uint64_t packetLength,
|
|
uint64_t maxCwndInMss,
|
|
uint64_t minCwndInMss) noexcept {
|
|
return std::max(
|
|
std::min(cwndBytes, maxCwndInMss * packetLength),
|
|
minCwndInMss * packetLength);
|
|
}
|
|
|
|
PacingRate calculatePacingRate(
|
|
const QuicConnectionStateBase& conn,
|
|
uint64_t cwnd,
|
|
uint64_t minCwndInMss,
|
|
std::chrono::microseconds rtt) {
|
|
if (conn.transportSettings.pacingTimerTickInterval > rtt) {
|
|
// We cannot really pace in this case.
|
|
return PacingRate::Builder()
|
|
.setInterval(0us)
|
|
.setBurstSize(conn.transportSettings.writeConnectionDataPacketsLimit)
|
|
.build();
|
|
}
|
|
uint64_t cwndInPackets = std::max(minCwndInMss, cwnd / conn.udpSendPacketLen);
|
|
// Each interval we want to send cwndInpackets / (rtt / minimalInverval)
|
|
// number of packets.
|
|
uint64_t burstPerInterval = std::max(
|
|
conn.transportSettings.minBurstPackets,
|
|
static_cast<uint64_t>(std::ceil(
|
|
static_cast<double>(cwndInPackets) *
|
|
static_cast<double>(
|
|
conn.transportSettings.pacingTimerTickInterval.count()) /
|
|
static_cast<double>(rtt.count()))));
|
|
auto interval = timeMax(
|
|
conn.transportSettings.pacingTimerTickInterval,
|
|
rtt * burstPerInterval / cwndInPackets);
|
|
return PacingRate::Builder()
|
|
.setInterval(interval)
|
|
.setBurstSize(burstPerInterval)
|
|
.build();
|
|
}
|
|
} // namespace quic
|