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Scale resend timeout exponentially

This commit is contained in:
sfan5 2024-01-05 10:19:49 +01:00
parent 7acb14f7a1
commit 84d4647329
2 changed files with 15 additions and 8 deletions
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5
src/constants.h
View File

@ -42,11 +42,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#define CONNECTION_TIMEOUT 30
#define RESEND_TIMEOUT_MIN 0.1
#define RESEND_TIMEOUT_MAX 3.0
// resend_timeout = avg_rtt * this
#define RESEND_TIMEOUT_FACTOR 4
/*
Server
*/

18
src/network/connection.cpp
View File

@ -51,6 +51,15 @@ namespace con
#define PING_TIMEOUT 5.0f
// exponent base
#define RESEND_SCALE_BASE 1.5f
// since spacing is exponential the numbers here shouldn't be too high
// (it's okay to start out quick)
#define RESEND_TIMEOUT_MIN 0.1f
#define RESEND_TIMEOUT_MAX 2.0f
#define RESEND_TIMEOUT_FACTOR 2
u16 BufferedPacket::getSeqnum() const
{
if (size() < BASE_HEADER_SIZE + 3)
@ -354,7 +363,10 @@ std::list<ConstSharedPtr<BufferedPacket>>
MutexAutoLock listlock(m_list_mutex);
std::list<ConstSharedPtr<BufferedPacket>> timed_outs;
for (auto &packet : m_list) {
if (packet->time < timeout)
// resend time scales exponentially with each cycle
const float pkt_timeout = timeout * powf(RESEND_SCALE_BASE, packet->resend_count);
if (packet->time < pkt_timeout)
continue;
// caller will resend packet so reset time and increase counter
@ -980,14 +992,14 @@ void UDPPeer::reportRTT(float rtt)
}
RTTStatistics(rtt,"rudp",MAX_RELIABLE_WINDOW_SIZE*10);
// use this value to decide the resend timeout
float timeout = getStat(AVG_RTT) * RESEND_TIMEOUT_FACTOR;
if (timeout < RESEND_TIMEOUT_MIN)
timeout = RESEND_TIMEOUT_MIN;
if (timeout > RESEND_TIMEOUT_MAX)
timeout = RESEND_TIMEOUT_MAX;
MutexAutoLock usage_lock(m_exclusive_access_mutex);
resend_timeout = timeout;
setResendTimeout(timeout);
}
bool UDPPeer::Ping(float dtime,SharedBuffer<u8>& data)