diff options
| -rw-r--r-- | eth/downloader/downloader.go | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go index 1e9bc27bc..aee21122a 100644 --- a/eth/downloader/downloader.go +++ b/eth/downloader/downloader.go @@ -1044,7 +1044,14 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv // Check for fetch request timeouts and demote the responsible peers for pid, fails := range expire() { if peer := d.peers.Peer(pid); peer != nil { - if fails > 1 { + // If a lot of retrieval elements expired, we might have overestimated the remote peer or perhaps + // ourselves. Only reset to minimal throughput but don't drop just yet. If even the minimal times + // out that sync wise we need to get rid of the peer. + // + // The reason the minimum threshold is 2 is because the downloader tries to estimate the bandwidth + // and latency of a peer separately, which requires pushing the measures capacity a bit and seeing + // how response times reacts, to it always requests one more than the minimum (i.e. min 2). + if fails > 2 { glog.V(logger.Detail).Infof("%s: %s delivery timeout", peer, strings.ToLower(kind)) setIdle(peer, 0) } else { |