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(trunk libT) taper off the number of new connections per pulse per torrent based on how long the torrent's been running. Brand-new torrents get a higher burst of new peer connection attempts, but long-running torrents don't need that kind of activity.

This commit is contained in:
Charles Kerr 2010-02-03 00:12:19 +00:00
parent 36d97610bd
commit 30f85172c4
1 changed files with 26 additions and 10 deletions
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36
libtransmission/peer-mgr.c
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@ -60,9 +60,6 @@ enum
/* when few peers are available, keep idle ones this long */
MAX_UPLOAD_IDLE_SECS = ( 60 * 5 ),
/* max # of peers to ask fer per torrent per reconnect pulse */
MAX_RECONNECTIONS_PER_PULSE = 8,
/* max number of peers to ask for per second overall.
* this throttle is to avoid overloading the router */
MAX_CONNECTIONS_PER_SECOND = 16,
@ -2685,6 +2682,23 @@ closePeer( Torrent * t, tr_peer * peer )
removePeer( t, peer );
}
/* Make a lot of slots available to newly-running torrents...
* once they reach steady state, they shouldn't need as many */
static int
maxNewPeersPerPulse( const Torrent * t )
{
double runTime;
const tr_torrent * tor = t->tor;
assert( tr_isTorrent( tor ) );
runTime = difftime( tr_time( ), tor->startDate );
if( runTime > 480 ) return 1;
if( runTime > 240 ) return 2;
if( runTime > 120 ) return 3;
return 4;
}
static void
reconnectTorrent( Torrent * t )
{
@ -2708,6 +2722,7 @@ reconnectTorrent( Torrent * t )
int mustCloseCount;
int maxCandidates;
struct tr_peer ** mustClose;
const int maxPerPulse = maxNewPeersPerPulse( t );
/* disconnect the really bad peers */
mustClose = getPeersToClose( t, TR_MUST_CLOSE, now, &mustCloseCount );
@ -2716,7 +2731,8 @@ reconnectTorrent( Torrent * t )
tr_free( mustClose );
/* decide how many peers can we try to add in this pass */
maxCandidates = MAX_RECONNECTIONS_PER_PULSE;
maxCandidates = maxPerPulse;
if( tr_announcerHasBacklog( t->manager->session->announcer ) )
maxCandidates /= 2;
maxCandidates = MIN( maxCandidates, getMaxPeerCount( t->tor ) - getPeerCount( t ) );
@ -2730,12 +2746,12 @@ reconnectTorrent( Torrent * t )
"max per pulse is %d",
t->tor->info.name, mustCloseCount,
tr_ptrArraySize( &t->pool ),
MAX_RECONNECTIONS_PER_PULSE );
maxPerPulse );
tordbg( t, "maxCandidates is %d, MAX_RECONNECTIONS_PER_PULSE is %d, "
tordbg( t, "maxCandidates is %d, maxPerPulse is %d, "
"getPeerCount(t) is %d, getMaxPeerCount(t) is %d, "
"newConnectionsThisSecond is %d, MAX_CONNECTIONS_PER_SECOND is %d",
maxCandidates, MAX_RECONNECTIONS_PER_PULSE,
maxCandidates, maxPerPulse,
getPeerCount( t ), getMaxPeerCount( t->tor ),
newConnectionsThisSecond, MAX_CONNECTIONS_PER_SECOND );
}
@ -2762,12 +2778,12 @@ reconnectTorrent( Torrent * t )
"%d atoms, max per pulse is %d",
t->tor->info.name, mustCloseCount,
canCloseCount, candidateCount,
tr_ptrArraySize( &t->pool ), MAX_RECONNECTIONS_PER_PULSE );
tr_ptrArraySize( &t->pool ), maxPerPulse );
tordbg( t, "candidateCount is %d, MAX_RECONNECTIONS_PER_PULSE is %d,"
tordbg( t, "candidateCount is %d, maxPerPulse is %d,"
" getPeerCount(t) is %d, getMaxPeerCount(t) is %d, "
"newConnectionsThisSecond is %d, MAX_CONNECTIONS_PER_SECOND is %d",
candidateCount, MAX_RECONNECTIONS_PER_PULSE,
candidateCount, maxPerPulse,
getPeerCount( t ), getMaxPeerCount( t->tor ),
newConnectionsThisSecond, MAX_CONNECTIONS_PER_SECOND );