diff --git a/device.go b/device.go
index 5081e72..5242478 100644
--- a/device.go
+++ b/device.go
@@ -256,6 +256,8 @@ func (nc *NetCard) runWrite() {
 			log.Panic(err)
 		}
 
+		log.Printf("get wframes len: %d", len(bufs))
+
 		for _, buf := range bufs {
 			_, err := ifce.Write(buf)
 			if err != nil {