diff --git a/src/tun/iface.go b/src/tun/iface.go
index 2028b130..3a4c55f4 100644
--- a/src/tun/iface.go
+++ b/src/tun/iface.go
@@ -1,17 +1,9 @@
 package tun
 
 const TUN_OFFSET_BYTES = 80 // sizeof(virtio_net_hdr)
-const TUN_MAX_VECTOR = 16
-
-func (tun *TunAdapter) idealBatchSize() int {
-	if b := tun.iface.BatchSize(); b <= TUN_MAX_VECTOR {
-		return b
-	}
-	return TUN_MAX_VECTOR
-}
 
 func (tun *TunAdapter) read() {
-	vs := tun.idealBatchSize()
+	vs := tun.iface.BatchSize()
 	bufs := make([][]byte, vs)
 	sizes := make([]int, vs)
 	for i := range bufs {
diff --git a/src/tun/tun.go b/src/tun/tun.go
index 027dfd00..e6795c64 100644
--- a/src/tun/tun.go
+++ b/src/tun/tun.go
@@ -162,7 +162,7 @@ func (tun *TunAdapter) _start() error {
 	tun.rwc.SetMTU(tun.MTU())
 	tun.isOpen = true
 	tun.isEnabled = true
-	tun.ch = make(chan []byte, tun.idealBatchSize())
+	tun.ch = make(chan []byte, tun.iface.BatchSize())
 	go tun.queue()
 	go tun.read()
 	go tun.write()