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Code Issues Releases Wiki Activity

(trunk libT) #2548 "T's request queue can send out too many duplicate requests" -- experimental revision to r9465 to address further overdownloading issues

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This commit is contained in:
Charles Kerr 2009-12-15 20:13:34 +00:00
parent c789454dba
commit 22e33f784b
1 changed files with 67 additions and 26 deletions
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93
libtransmission/peer-mgr.c
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@ -566,8 +566,15 @@ compareReqByBlock( const void * va, const void * vb )
{
const struct block_request * a = va;
const struct block_request * b = vb;
/* primary key: block */
if( a->block < b->block ) return -1;
if( a->block > b->block ) return 1;
/* secondary key: peer */
if( a->peer < b->peer ) return -1;
if( a->peer > b->peer ) return 1;
return 0;
}
@ -576,8 +583,15 @@ compareReqByTime( const void * va, const void * vb )
{
const struct block_request * a = va;
const struct block_request * b = vb;
/* primary key: time */
if( a->sentAt < b->sentAt ) return -1;
if( a->sentAt > b->sentAt ) return 1;
/* secondary key: peer */
if( a->peer < b->peer ) return -1;
if( a->peer > b->peer ) return 1;
return 0;
}
@ -646,10 +660,11 @@ requestListAdd( Torrent * t, const time_t now, tr_block_index_t block, tr_peer *
}
static struct block_request *
requestListLookup( Torrent * t, tr_block_index_t block )
requestListLookup( Torrent * t, tr_block_index_t block, const tr_peer * peer )
{
struct block_request key;
key.block = block;
key.peer = (tr_peer*) peer;
requestListSort( t, REQ_SORTED_BY_BLOCK );
@ -658,10 +673,37 @@ requestListLookup( Torrent * t, tr_block_index_t block )
compareReqByBlock );
}
static void
requestListRemove( Torrent * t, tr_block_index_t block )
static int
countBlockRequests( Torrent * t, tr_block_index_t block )
{
const struct block_request * b = requestListLookup( t, block );
tr_bool exact;
int i, n, pos;
struct block_request key;
requestListSort( t, REQ_SORTED_BY_BLOCK );
key.block = block;
key.peer = NULL;
pos = tr_lowerBound( &key, t->requests, t->requestCount,
sizeof( struct block_request ),
compareReqByBlock, &exact );
assert( !exact ); /* shouldn't have a request with .peer == NULL */
n = 0;
for( i=pos; i<t->requestCount; ++i ) {
if( t->requests[i].block == block )
++n;
else
break;
}
return n;
}
static void
requestListRemove( Torrent * t, tr_block_index_t block, const tr_peer * peer )
{
const struct block_request * b = requestListLookup( t, block, peer );
if( b != NULL )
{
const int pos = b - t->requests;
@ -920,6 +962,11 @@ tr_peerMgrGetNextRequests( tr_torrent * tor,
for( i=0; i<t->pieceCount && got<numwant; ++i )
{
struct weighted_piece * p = pieces + i;
const int missing = tr_cpMissingBlocksInPiece( &tor->completion, p->index );
const int maxDuplicatesPerBlock = t->isInEndgame ? 3 : 1;
if( p->requestCount > ( missing * maxDuplicatesPerBlock ) )
continue;
/* if the peer has this piece that we want... */
if( tr_bitsetHasFast( have, p->index ) )
@ -929,32 +976,30 @@ tr_peerMgrGetNextRequests( tr_torrent * tor,
for( ; b!=e && got<numwant; ++b )
{
struct block_request * breq;
/* don't request blocks we've already got */
if( tr_cpBlockIsCompleteFast( &tor->completion, b ) )
continue;
/* don't request blocks we've already requested (FIXME) */
breq = requestListLookup( t, b );
if( breq != NULL ) {
assert( breq->peer != NULL );
if( breq->peer == peer ) continue;
if( !t->isInEndgame ) continue;
}
/* don't send the same request to the same peer twice */
if( tr_peerMgrDidPeerRequest( tor, peer, b ) )
continue;
/* don't send the same request to any peer too many times */
if( countBlockRequests( t, b ) > maxDuplicatesPerBlock )
continue;
/* update the caller's table */
setme[got++] = b;
/* update our own tables */
if( breq == NULL )
requestListAdd( t, now, b, peer );
requestListAdd( t, now, b, peer );
++p->requestCount;
}
}
}
/* In most cases we've just changed the weights of a small number of pieces.
* So rather than qsort()ing the entire array, it's faster to sort just the
* So rather than qsort()ing the entire array, it's faster to sort only the
* changed ones, then do a standard merge-two-sorted-arrays pass on the
* changed and unchanged pieces. */
if( got > 0 )
@ -1001,11 +1046,7 @@ tr_peerMgrDidPeerRequest( const tr_torrent * tor,
tr_block_index_t block )
{
const Torrent * t = tor->torrentPeers;
const struct block_request * b = requestListLookup( (Torrent*)t, block );
if( b == NULL ) return FALSE;
if( b->peer == peer ) return TRUE;
if( t->isInEndgame ) return TRUE;
return FALSE;
return requestListLookup( (Torrent*)t, block, peer ) != NULL;
}
/* cancel requests that are too old */
@ -1151,9 +1192,9 @@ clientGotUnwantedBlock( tr_torrent * tor, tr_block_index_t block )
}
static void
removeRequestFromTables( Torrent * t, tr_block_index_t block )
removeRequestFromTables( Torrent * t, tr_block_index_t block, const tr_peer * peer )
{
requestListRemove( t, block );
requestListRemove( t, block, peer );
pieceListRemoveRequest( t, block );
}
@ -1170,7 +1211,7 @@ peerDeclinedAllRequests( Torrent * t, const tr_peer * peer )
blocks[n++] = t->requests[i].block;
for( i=0; i<n; ++i )
removeRequestFromTables( t, blocks[i] );
removeRequestFromTables( t, blocks[i], peer );
tr_free( blocks );
}
@ -1225,7 +1266,7 @@ peerCallbackFunc( void * vpeer, void * vevent, void * vt )
}
case TR_PEER_CLIENT_GOT_REJ:
removeRequestFromTables( t, _tr_block( t->tor, e->pieceIndex, e->offset ) );
removeRequestFromTables( t, _tr_block( t->tor, e->pieceIndex, e->offset ), peer );
break;
case TR_PEER_CLIENT_GOT_CHOKE:
@ -1295,7 +1336,7 @@ peerCallbackFunc( void * vpeer, void * vevent, void * vt )
tr_torrent * tor = t->tor;
tr_block_index_t block = _tr_block( tor, e->pieceIndex, e->offset );
requestListRemove( t, block );
requestListRemove( t, block, peer );
pieceListRemoveRequest( t, block );
if( tr_cpBlockIsComplete( &tor->completion, block ) )