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add constants for RTT estimation calculations

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Stephen Birarda 2015-07-28 15:59:13 -07:00
parent a49ad92d87
commit 13568d3d69
1 changed files with 7 additions and 2 deletions
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9
libraries/networking/src/udt/Connection.cpp
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@ -337,6 +337,11 @@ void Connection::updateRTT(int rtt) {
// Deviation = (1 - x)(deviation) + x |sampleRTT - estimatedRTT|
// (where x = 0.25 via Jacobson)
_rttVariance = (_rttVariance * 3 + abs(rtt - _rtt)) >> 2;
_rtt = (_rtt * 7 + rtt) >> 3;
static const int RTT_ESTIMATION_ALPHA_NUMERATOR = 8;
static const int RTT_ESTIMATION_VARIANCE_ALPHA_NUMERATOR = 4;
_rtt = (_rtt * (1 - RTT_ESTIMATION_ALPHA_NUMERATOR) + rtt) / RTT_ESTIMATION_ALPHA_NUMERATOR;
_rttVariance = (_rttVariance * (1 - RTT_ESTIMATION_VARIANCE_ALPHA_NUMERATOR)
+ abs(rtt - _rtt)) / RTT_ESTIMATION_VARIANCE_ALPHA_NUMERATOR;
}