diff options
| -rw-r--r-- | src/net/peerdisc.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/net/peerdisc.c b/src/net/peerdisc.c index 55e3f7fa7..d7e0d2989 100644 --- a/src/net/peerdisc.c +++ b/src/net/peerdisc.c @@ -73,6 +73,9 @@ static LIST_HEAD ( peerdisc_segments ); */ unsigned int peerdisc_timeout_secs = PEERDISC_DEFAULT_TIMEOUT_SECS; +/** Most recently discovered peer (for any block) */ +static char *peerdisc_recent; + /** Hosted cache server */ static char *peerhost; @@ -383,6 +386,7 @@ static int peerdisc_discovered ( struct peerdisc_segment *segment, struct peerdisc_peer *peer; struct peerdisc_client *peerdisc; struct peerdisc_client *tmp; + char *recent; /* Ignore duplicate peers */ list_for_each_entry ( peer, &segment->peers, list ) { @@ -403,6 +407,15 @@ static int peerdisc_discovered ( struct peerdisc_segment *segment, /* Add to end of list of peers */ list_add_tail ( &peer->list, &segment->peers ); + /* Record as most recently discovered peer */ + if ( location != peerdisc_recent ) { + recent = strdup ( location ); + if ( recent ) { + free ( peerdisc_recent ); + peerdisc_recent = recent; + } + } + /* Notify all clients */ list_for_each_entry_safe ( peerdisc, tmp, &segment->clients, list ) peerdisc->op->discovered ( peerdisc ); @@ -484,6 +497,16 @@ static struct peerdisc_segment * peerdisc_create ( const char *id ) { } else { + /* Add most recently discovered peer to list of peers + * + * This is a performance optimisation: we assume that + * the most recently discovered peer for any block has + * a high probability of also having a copy of the + * next block that we attempt to discover. + */ + if ( peerdisc_recent ) + peerdisc_discovered ( segment, peerdisc_recent ); + /* Start discovery timer */ start_timer_nodelay ( &segment->timer ); DBGC2 ( segment, "PEERDISC %p discovering %s\n", |