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(trunk libT) #2551: when uploading to peers, prefetch local data from disk

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This commit is contained in:
Charles Kerr 2009-11-10 17:26:04 +00:00
parent 44df1d5548
commit 1f0fdba2e8
1 changed files with 35 additions and 4 deletions
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31
libtransmission/peer-msgs.c
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@ -172,6 +172,8 @@ struct tr_peermsgs
int activeRequestCount;
int desiredRequestCount;
int prefetchCount;
/* how long the outMessages batch should be allowed to grow before
* it's flushed -- some messages (like requests >:) should be sent
* very quickly; others aren't as urgent. */
@ -1609,6 +1611,31 @@ updateRequests( tr_peermsgs * msgs )
}
}
static void
prefetchPieces( tr_peermsgs *msgs )
{
int i;
uint64_t next = 0;
/* Maintain at least 8 prefetched blocks per unchoked peer, but allow
up to 4 extra blocks if that would cause sequential writes. */
for( i=msgs->prefetchCount; i<msgs->peerAskedForCount; ++i )
{
const struct peer_request * req = msgs->peerAskedFor + i;
const uint64_t begin = tr_pieceOffset( msgs->torrent, req->index, req->offset, 0 );
const uint64_t end = begin + req->length;
const tr_bool isSequential = next == begin;
if( ( i >= 12 ) || ( !isSequential && ( i >= 8 ) ) )
break;
tr_ioPrefetch( msgs->torrent, req->index, req->offset, req->length );
++msgs->prefetchCount;
next = end;
}
}
static size_t
fillOutputBuffer( tr_peermsgs * msgs, time_t now )
{
@ -1645,6 +1672,8 @@ fillOutputBuffer( tr_peermsgs * msgs, time_t now )
if( ( tr_peerIoGetWriteBufferSpace( msgs->peer->io, now ) >= msgs->torrent->blockSize )
&& popNextRequest( msgs, &req ) )
{
--msgs->prefetchCount;
if( requestIsValid( msgs, &req )
&& tr_cpPieceIsComplete( &msgs->torrent->completion, req.index ) )
{
@ -1690,6 +1719,8 @@ fillOutputBuffer( tr_peermsgs * msgs, time_t now )
{
protocolSendReject( msgs, &req );
}
prefetchPieces( msgs );
}
/**