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(trunk libT) #3600 "Improve rechokeDownloads' peer limiter" -- fixed with patch from Longinus00
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1 changed files with 25 additions and 58 deletions
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@ -202,12 +202,7 @@ typedef struct tr_torrent_peers
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int interestedCount;
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int maxPeers;
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tr_recentHistory * noBlocksCancelsCount;
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/* An arbitrary metric of how congested the downloads are.
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* Based on how many of requests are cancelled and how many are completed.
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* Lower values indicate less congestion. */
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double cancelRate;
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time_t lastCancel;
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}
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Torrent;
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@ -460,7 +455,6 @@ torrentDestructor( void * vt )
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tr_ptrArrayDestruct( &t->pool, (PtrArrayForeachFunc)tr_free );
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tr_ptrArrayDestruct( &t->outgoingHandshakes, NULL );
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tr_ptrArrayDestruct( &t->peers, NULL );
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tr_historyFree( t->noBlocksCancelsCount );
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tr_free( t->requests );
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tr_free( t->pieces );
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@ -483,7 +477,6 @@ torrentConstructor( tr_peerMgr * manager,
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t->peers = TR_PTR_ARRAY_INIT;
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t->webseeds = TR_PTR_ARRAY_INIT;
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t->outgoingHandshakes = TR_PTR_ARRAY_INIT;
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t->noBlocksCancelsCount = tr_historyNew( NO_BLOCKS_CANCEL_HISTORY, ( RECHOKE_PERIOD_MSEC / 1000 ) );
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for( i = 0; i < tor->info.webseedCount; ++i )
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{
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@ -2072,6 +2065,7 @@ tr_peerMgrStartTorrent( tr_torrent * tor )
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ensureMgrTimersExist( t->manager );
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t->isRunning = TRUE;
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t->maxPeers = t->tor->maxConnectedPeers;
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rechokePulse( 0, 0, t->manager );
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managerUnlock( t->manager );
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@ -2463,6 +2457,7 @@ rechokeDownloads( Torrent * t )
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{
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int blocks = 0;
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int cancels = 0;
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time_t timeSinceCancel;
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/* Count up how many blocks & cancels each peer has.
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*
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@ -2491,62 +2486,34 @@ rechokeDownloads( Torrent * t )
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cancels += c;
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}
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if( !t->maxPeers )
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if( cancels > 0 )
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{
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/* this is the torrent's first time to call this function...
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* start off optimistically by allowing interest in many peers */
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maxPeers = t->tor->maxConnectedPeers;
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/* cancelRate: of the block requests we've recently made, the percentage we cancelled.
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* higher values indicate more congestion. */
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const double cancelRate = cancels / (double)(cancels + blocks);
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const double mult = 1 - MIN( cancelRate, 0.5 );
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maxPeers = t->interestedCount * mult;
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tordbg( t, "cancel rate is %.3f -- reducing the "
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"number of peers we're interested in by %.0f percent",
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cancelRate, mult * 100 );
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t->lastCancel = now;
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}
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else if( !blocks && cancels )
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timeSinceCancel = now - t->lastCancel;
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if( timeSinceCancel )
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{
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/* we've gotten cancels but zero blocks...
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* something is seriously wrong. throttle back sharply */
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maxPeers = t->interestedCount * 0.5;
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}
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else if( blocks )
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{
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const double cancelRate = cancels / (double)(cancels + blocks );
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/* if we're getting cancels then use interestedCount instead of
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* maxPeers to scale faster */
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if( cancelRate >= 0.20 ) maxPeers = t->interestedCount * 0.7;
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else if( cancelRate >= 0.10 ) maxPeers = t->interestedCount * 0.8;
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else if( cancelRate >= 0.05 ) maxPeers = t->interestedCount * 0.9;
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else if( cancelRate >= 0.01 ) maxPeers = t->interestedCount;
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else maxPeers = t->maxPeers + 1;
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/* if things are getting worse, don't add more peers */
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if( ( t->cancelRate > 0.01 ) && ( cancelRate > t->cancelRate ) )
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maxPeers = MIN( maxPeers, t->maxPeers );
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t->cancelRate = cancelRate;
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tordbg( t, "cancel rate is %.3f -- changing the "
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"number of peers we're interested in from %d to %d",
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cancelRate, t->maxPeers, maxPeers );
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}
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else
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{
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const unsigned maxCount = 10; /* maximum times in this block in the past two minutes */
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tr_historyAdd( t->noBlocksCancelsCount, now, 1 );
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if( tr_historyGet( t->noBlocksCancelsCount, now, NO_BLOCKS_CANCEL_HISTORY ) < maxCount )
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{
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/* no blocks and no cancels means either that the torrent
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* just started or peers are unresponsive/nonexistent,
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* either way there's nothing to do */
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maxPeers = t->maxPeers;
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}
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else
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{
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/* we've been in here for a while so maybe the network is down or there are no
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* good peers. maximize the chance of connecting to a good peer
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* if/when they show up */
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maxPeers = t->tor->maxConnectedPeers;
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}
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const int maxIncrease = 15;
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const time_t maxHistory = 2 * CANCEL_HISTORY_SEC;
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const double mult = MIN( timeSinceCancel, maxHistory ) / (double) maxHistory;
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const int inc = maxIncrease * mult;
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maxPeers = t->maxPeers + inc;
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tordbg( t, "time since last cancel is %li -- increasing the "
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"number of peers we're interested in by %d",
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timeSinceCancel, inc );
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}
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}
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/* don't let the previous paragraph's number tweaking go too far... */
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/* don't let the previous section's number tweaking go too far... */
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if( maxPeers < MIN_INTERESTING_PEERS )
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maxPeers = MIN_INTERESTING_PEERS;
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if( maxPeers > t->tor->maxConnectedPeers )
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