izackp/mosh
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Only display prediction overlay when triggered by slowness

Browse Source 
Here we maintain the predictions always, but we only display the overlay
when either a threshold of smoothed round-trip time is met or temporarily
after a "glitch."
This commit is contained in:
Keith Winstein
2012-02-09 02:56:01 -05:00
parent 354dff39c8
commit 0b4cf8af3d
2 changed files with 68 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/frontend/terminaloverlay.cc
+42 -14
View File
@@ -29,7 +29,7 @@ using namespace Overlay;
bool ConditionalOverlay::start_clock( uint64_t local_frame_acked, uint64_t now, unsigned int send_interval )
{
if ( (local_frame_acked >= expiration_frame) && (expiration_time == uint64_t(-1)) ) {
expiration_time = now + 50 + 125 * send_interval / 100;
expiration_time = now + 75 + 125 * send_interval / 100;
return true;
}
return false;
@@ -318,9 +318,13 @@ void ConditionalOverlayRow::apply( Framebuffer &fb, uint64_t confirmed_epoch, bo
void PredictionEngine::apply( Framebuffer &fb ) const
{
for_each( cursors.begin(), cursors.end(), [&]( const ConditionalCursorMove &x ) { x.apply( fb, confirmed_epoch ); } );
bool show = srtt_trigger || glitch_trigger;
for_each( overlays.begin(), overlays.end(), [&]( const ConditionalOverlayRow &x ){ x.apply( fb, confirmed_epoch, flagging ); } );
if ( show ) {
for_each( cursors.begin(), cursors.end(), [&]( const ConditionalCursorMove &x ) { x.apply( fb, confirmed_epoch ); } );
for_each( overlays.begin(), overlays.end(), [&]( const ConditionalOverlayRow &x ){ x.apply( fb, confirmed_epoch, flagging ); } );
}
}
void PredictionEngine::kill_epoch( uint64_t epoch, const Framebuffer &fb )
@@ -378,10 +382,17 @@ void PredictionEngine::cull( const Framebuffer &fb )
{
uint64_t now = timestamp();
/* control srtt_trigger with hysteresis */
if ( send_interval > SRTT_TRIGGER_HIGH ) {
srtt_trigger = true;
} else if ( send_interval <= SRTT_TRIGGER_LOW ) { /* 20 ms is current minimum value */
srtt_trigger = false;
}
/* control flagging with hysteresis */
if ( send_interval > 80 ) {
if ( send_interval > FLAG_TRIGGER_HIGH ) {
flagging = true;
} else if ( send_interval < 50 ) {
} else if ( send_interval <= FLAG_TRIGGER_LOW ) {
flagging = false;
}
@@ -457,12 +468,26 @@ void PredictionEngine::cull( const Framebuffer &fb )
}
/* When predictions come in quickly, slowly take away the glitch trigger. */
if ( (now - j->prediction_time) < GLITCH_THRESHOLD ) {
if ( (glitch_trigger > 0) && (now - GLITCH_REPAIR_MININTERVAL >= last_quick_confirmation) ) {
glitch_trigger--;
last_quick_confirmation = now;
}
}
/* no break */
case CorrectNoCredit:
j->reset();
break;
case Pending:
/* When a prediction takes a long time to be confirmed, we
activate the predictions even if SRTT is low */
if ( (now - j->prediction_time) >= GLITCH_THRESHOLD ) {
glitch_trigger = GLITCH_REPAIR_COUNT;
}
break;
default:
break;
@@ -527,6 +552,8 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
{
cull( fb );
uint64_t now = timestamp();
/* translate application-mode cursor control function to ANSI cursor control sequence */
if ( (last_byte == 0x1b)
&& (the_byte == 'O') ) {
@@ -560,7 +587,7 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
if ( cursor().col > 0 ) {
cursor().col--;
cursor().expire( local_frame_sent + 1 );
cursor().expire( local_frame_sent + 1, now );
for ( int i = cursor().col; i < fb.ds.get_width(); i++ ) {
ConditionalOverlayCell &cell = the_row.overlay_cells[ i ];
@@ -568,7 +595,7 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
cell.reset_with_orig();
cell.active = true;
cell.tentative_until_epoch = prediction_epoch;
cell.expire( local_frame_sent + 1 );
cell.expire( local_frame_sent + 1, now );
cell.original_contents.push_back( *fb.get_cell( cursor().row, i ) );
if ( i + 2 < fb.ds.get_width() ) {
@@ -615,7 +642,7 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
cell.reset_with_orig();
cell.active = true;
cell.tentative_until_epoch = prediction_epoch;
cell.expire( local_frame_sent + 1 );
cell.expire( local_frame_sent + 1, now );
cell.original_contents.push_back( *fb.get_cell( cursor().row, i ) );
ConditionalOverlayCell &prev_cell = the_row.overlay_cells[ i - 1 ];
@@ -640,7 +667,7 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
cell.reset_with_orig();
cell.active = true;
cell.tentative_until_epoch = prediction_epoch;
cell.expire( local_frame_sent + 1 );
cell.expire( local_frame_sent + 1, now );
cell.replacement.renditions = fb.ds.get_renditions();
cell.replacement.contents.clear();
cell.replacement.contents.push_back( ch );
@@ -653,7 +680,7 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
cell.tentative_until_epoch );
*/
cursor().expire( local_frame_sent + 1 );
cursor().expire( local_frame_sent + 1, now );
/* do we need to wrap? */
if ( cursor().col < fb.ds.get_width() - 1 ) {
@@ -679,14 +706,14 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
init_cursor( fb );
if ( cursor().col < fb.ds.get_width() - 1 ) {
cursor().col++;
cursor().expire( local_frame_sent + 1 );
cursor().expire( local_frame_sent + 1, now );
}
} else if ( act->char_present && (act->ch == L'D') ) { /* left arrow */
init_cursor( fb );
if ( cursor().col > 0 ) {
cursor().col--;
cursor().expire( local_frame_sent + 1 );
cursor().expire( local_frame_sent + 1, now );
}
} else {
// fprintf( stderr, "CSI sequence %lc\n", act->ch );
@@ -702,6 +729,7 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
void PredictionEngine::newline_carriage_return( const Framebuffer &fb )
{
uint64_t now = timestamp();
init_cursor( fb );
cursor().col = 0;
if ( cursor().row == fb.ds.get_height() - 1 ) {
@@ -709,7 +737,7 @@ void PredictionEngine::newline_carriage_return( const Framebuffer &fb )
i->row_num--;
for ( auto j = i->overlay_cells.begin(); j != i->overlay_cells.end(); j++ ) {
if ( j->active ) {
j->expire( local_frame_sent + 1 );
j->expire( local_frame_sent + 1, now );
}
}
}
@@ -719,7 +747,7 @@ void PredictionEngine::newline_carriage_return( const Framebuffer &fb )
for ( auto j = the_row.overlay_cells.begin(); j != the_row.overlay_cells.end(); j++ ) {
j->active = true;
j->tentative_until_epoch = prediction_epoch;
j->expire( local_frame_sent + 1 );
j->expire( local_frame_sent + 1, now );
j->replacement.contents.clear();
}
} else {