diff --git a/tunnel.go b/tunnel.go
index 852f5c4..cdfaacf 100644
--- a/tunnel.go
+++ b/tunnel.go
@@ -59,30 +59,15 @@ func (this *Tunnel) run() { //单向的，从src发送到dest
 
 		}
 	}()
-	cache := make([]byte, 1024*32) //128kB
+	cache := make([]byte, 1024*4) //4kB
 	//构建Carrier
-	// revCarrier := &tscipher.Carrier{
-	// 	src,
-	// 	tscipher.NewCipher("XOR"),
-	// 	cache,
-	// 	this.id,
-	// }
 	revCarrier := tscipher.NewCarrier(src, tscipher.NewCipher("XOR"), cache, this.id)
-	// sendCarrier := &tscipher.Carrier{
-	// 	dest,
-	// 	tscipher.NewCipher("XOR"),
-	// 	cache, //TODO:危险，cache的容量容易被不小心修改
-	// 	this.id,
-	// }
 	sendCarrier := tscipher.NewCarrier(dest, tscipher.NewCipher("XOR"), cache, this.id)
 	for {
-		// log.Info("a loop Tunnel id %s", id)
 		var nByte int
-		// log.Debug("Encrypt Direction %s ID %s", cipherDirection, id)
 		var err error
 		if cipherDirection != "receive" {
 			revCarrier.Cipher = nil
-			// log.Debug("Read not crypted. Tunnel: %s", id)
 			nByte, err = tscipher.RowReceiveData(revCarrier)
 		} else {
 			nByte, err = tscipher.ReceiveData(revCarrier)
@@ -93,21 +78,12 @@ func (this *Tunnel) run() { //单向的，从src发送到dest
 		log.Info("Reived %d bytes from %s. Tunnel: id %s", nByte, src.RemoteAddr().String(), id)
 		if cipherDirection != "send" {
 			sendCarrier.Cipher = nil
-			// log.Debug("Write not crypted. Tunnel: %s", id)
 		}
-		// for {
 		n, err := tscipher.SendData(sendCarrier, nByte)
 		if err != nil {
 			log.Panic("Write panic. ID: %s, Err: %s, Remote Add: %s", id, err, dest.RemoteAddr().String())
 		}
 		log.Info("Write %d bytes from %s to %s. Tunnel: %s . 18 bytes", n, dest.LocalAddr(), dest.RemoteAddr().String(), id, string(sendCarrier.Cache[:18]))
-		// if n == 0 {
-		// 	log.Info("Retry Write id %s", id)
-		// 	continue
-		// }
-		// break
-		// }
-
 	}
 
 }