diff --git a/.golangci.yml b/.golangci.yml
index ca6c686..27694b3 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -4,8 +4,8 @@ linters-settings:
     ignoretests: true
     exclude-functions:
       - (*os.File).Write
-      - (*github.com/fumiama/WireGold/bin.Writer).Write
-      - (*github.com/fumiama/WireGold/bin.Writer).WriteByte
+      - (*github.com/fumiama/WireGold/internal/bin.Writer).Write
+      - (*github.com/fumiama/WireGold/internal/bin.Writer).WriteByte
       - (*github.com/fumiama/WireGold/upper/services/tunnel.Tunnel).Write
       - (*github.com/fumiama/WireGold/upper/services/tunnel.Tunnel).Read
 
diff --git a/config/global.go b/config/global.go
index df62328..4bcfe7d 100644
--- a/config/global.go
+++ b/config/global.go
@@ -1,3 +1,3 @@
 package config
 
-const ShowDebugLog = true
+const ShowDebugLog = false
diff --git a/gold/head/builder.go b/gold/head/builder.go
index c05839e..5826465 100644
--- a/gold/head/builder.go
+++ b/gold/head/builder.go
@@ -95,11 +95,11 @@ func (pb *DataBuilder) Zstd() *DataBuilder {
 }
 
 func (pb *DataBuilder) Hash() *DataBuilder {
-	return (*DataBuilder)(pb.p(func(ub *PacketBuf) {
+	return pb.p(func(ub *PacketBuf) {
 		ub.DAT.hash = algo.Blake2bHash8(
 			uint64(ub.DAT.md5h8rem), ub.Bytes(),
 		)
-	}))
+	})
 }
 
 func (pb *DataBuilder) tea(typ uint8) *DataBuilder {
diff --git a/gold/head/pool.go b/gold/head/pool.go
index fca7e05..a60d022 100644
--- a/gold/head/pool.go
+++ b/gold/head/pool.go
@@ -8,5 +8,5 @@ var packetPool = pbuf.NewBufferPool[Packet]()
 
 // selectPacket 从池中取出一个 Packet
 func selectPacket(buf ...byte) *PacketItem {
-	return (*PacketItem)(packetPool.NewBuffer(buf))
+	return packetPool.NewBuffer(buf)
 }
diff --git a/gold/link/send.go b/gold/link/send.go
index 2bf659e..c241bf8 100644
--- a/gold/link/send.go
+++ b/gold/link/send.go
@@ -65,14 +65,14 @@ func (l *Link) WritePacket(proto uint8, data []byte) {
 // 因为不保证可达所以不返回错误。
 func (l *Link) write2peer(b pbuf.Bytes, seq uint32) {
 	if l.doublepacket {
-		_, err := l.write2peer1(b, seq)
+		err := l.write2peer1(b, seq)
 		if err != nil {
 			if config.ShowDebugLog {
 				logrus.Warnln("[send] double wr2peer", l.peerip, "err:", err)
 			}
 		}
 	}
-	_, err := l.write2peer1(b, seq)
+	err := l.write2peer1(b, seq)
 	if err != nil {
 		if config.ShowDebugLog {
 			logrus.Warnln("[send] wr2peer", l.peerip, "err:", err)
@@ -81,15 +81,15 @@ func (l *Link) write2peer(b pbuf.Bytes, seq uint32) {
 }
 
 // write2peer1 计算 xor + b14 后向 peer 发一个包
-func (l *Link) write2peer1(b pbuf.Bytes, seq uint32) (n int, err error) {
+func (l *Link) write2peer1(b pbuf.Bytes, seq uint32) (err error) {
 	peerep := l.endpoint
 	if bin.IsNilInterface(peerep) {
-		return 0, errors.New("nil endpoint of " + l.peerip.String())
+		return errors.New("nil endpoint of " + l.peerip.String())
 	}
 
 	conn := l.me.conn
 	if conn == nil {
-		return 0, io.ErrClosedPipe
+		return io.ErrClosedPipe
 	}
 	b.V(func(data []byte) {
 		if config.ShowDebugLog {
@@ -134,7 +134,7 @@ func (l *Link) write2peer1(b pbuf.Bytes, seq uint32) (n int, err error) {
 		if config.ShowDebugLog {
 			logrus.Debugln("[send] write", len(b), "bytes data from ep", conn.LocalAddr(), "to", peerep)
 		}
-		n, err = conn.WriteToPeer(b, peerep)
+		_, err = conn.WriteToPeer(b, peerep)
 	})
 	return
 }