core: added chain head reset to known block

eth/downloader/downloader.go

@@ -472,6 +472,8 @@ func (d *Downloader) process() error {
 			}
 			break
 		} else if err != nil {
+			// immediatly unregister the false peer but do not disconnect
+			d.UnregisterPeer(d.activePeer)
 			// Reset chain completely. This needs much, much improvement.
 			// instead: check all blocks leading down to this block false block and remove it
 			blocks = nil

eth/handler.go

@@ -36,6 +36,7 @@ pm.chainman.InsertChain(blocks)
 
 import (
 	"fmt"
+	"math"
 	"math/big"
 	"sync"
 
@@ -326,7 +327,7 @@ func (pm *ProtocolManager) BroadcastBlock(hash common.Hash, block *types.Block)
 	}
 	// Broadcast block to peer set
 	// XXX due to the current shit state of the network disable the limit
-	//peers = peers[:int(math.Sqrt(float64(len(peers))))]
+	peers = peers[:int(math.Sqrt(float64(len(peers))))]
 	for _, peer := range peers {
 		peer.sendNewBlock(block)
 	}