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Refine SRTT estimate, adjust echo timeout formula

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This commit is contained in:
Keith Winstein
2011-10-13 20:45:55 -04:00
parent cf45825c99
commit d2a6ebf0a1
1 changed files with 5 additions and 4 deletions
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terminaloverlay.cpp
+5 -4
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@@ -101,7 +101,8 @@ void PredictionEngine::cull( const Framebuffer &fb )
auto i = elements.begin(); auto i = elements.begin();
while ( i != elements.end() ) { while ( i != elements.end() ) {
/* update echo timeout state */ /* update echo timeout state */
if ( (*i)->get_validity( fb ) == Correct ) { if ( (typeid( ConditionalOverlayCell ) == typeid( **i ))
&& ((*i)->get_validity( fb ) == Correct) ) {
double R = now - (*i)->prediction_time; double R = now - (*i)->prediction_time;
if ( !RTT_hit ) { /* first measurement */ if ( !RTT_hit ) { /* first measurement */
SRTT = R; SRTT = R;
@@ -125,8 +126,8 @@ void PredictionEngine::cull( const Framebuffer &fb )
} }
} }
if ( SRTT > 500 ) flagging = true; /* start underlining predicted chars */ if ( SRTT > 150 ) flagging = true; /* start underlining predicted chars */
if ( SRTT < 150 ) flagging = false; /* use some hysterisis to avoid flapping */ if ( SRTT + 4 * RTTVAR < 100 ) flagging = false; /* use some hysterisis to avoid flapping */
} }
OverlayCell::OverlayCell( uint64_t expiration_time, int s_row, int s_col, int background_color ) OverlayCell::OverlayCell( uint64_t expiration_time, int s_row, int s_col, int background_color )
@@ -387,7 +388,7 @@ int OverlayManager::wait_time( void )
int PredictionEngine::prediction_len( void ) int PredictionEngine::prediction_len( void )
{ {
uint64_t RTO = lrint( ceil( 1.25 * SRTT + 8 * RTTVAR ) ); uint64_t RTO = lrint( ceil( 1.5 * SRTT + 10 * RTTVAR ) );
if ( RTO < 20 ) { if ( RTO < 20 ) {
RTO = 20; RTO = 20;
} else if ( RTO > 2000 ) { } else if ( RTO > 2000 ) {