diff --git a/common/buf/multi_buffer.go b/common/buf/multi_buffer.go
index b65a14713..57ccf6824 100644
--- a/common/buf/multi_buffer.go
+++ b/common/buf/multi_buffer.go
@@ -98,17 +98,24 @@ func ReadFrom(reader io.Reader) (MultiBuffer, error) {
 // It returns the new address of MultiBuffer leftover, and number of bytes written into the input byte slice.
 func SplitBytes(mb MultiBuffer, b []byte) (MultiBuffer, int) {
 	totalBytes := 0
-
-	for len(mb) > 0 {
-		bb := mb[0]
-		nBytes, _ := bb.Read(b)
+	endIndex := -1
+	for i := range mb {
+		pBuffer := mb[i]
+		nBytes, _ := pBuffer.Read(b)
 		totalBytes += nBytes
 		b = b[nBytes:]
-		if !bb.IsEmpty() {
+		if !pBuffer.IsEmpty() {
+			endIndex = i
 			break
 		}
-		bb.Release()
-		mb = mb[1:]
+		pBuffer.Release()
+		mb[i] = nil
+	}
+
+	if endIndex == -1 {
+		mb = mb[:0]
+	} else {
+		mb = mb[endIndex:]
 	}
 
 	return mb, totalBytes
diff --git a/common/buf/multi_buffer_test.go b/common/buf/multi_buffer_test.go
index 8fd20d4d3..59b4edfb2 100644
--- a/common/buf/multi_buffer_test.go
+++ b/common/buf/multi_buffer_test.go
@@ -94,3 +94,16 @@ func TestMultiBufferSplitFirst(t *testing.T) {
 		t.Error("expect empty buffer, but got ", mb.String())
 	}
 }
+
+func BenchmarkSplitBytes(b *testing.B) {
+	var mb MultiBuffer
+	raw := make([]byte, Size)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		buffer := StackNew()
+		buffer.Extend(Size)
+		mb = append(mb, &buffer)
+		mb, _ = SplitBytes(mb, raw)
+	}
+}
diff --git a/common/buf/readv_reader.go b/common/buf/readv_reader.go
index ef10ead35..cf3bd49b3 100644
--- a/common/buf/readv_reader.go
+++ b/common/buf/readv_reader.go
@@ -48,6 +48,7 @@ type multiReader interface {
 	Clear()
 }
 
+// ReadVReader is a Reader that uses readv(2) syscall to read data.
 type ReadVReader struct {
 	io.Reader
 	rawConn syscall.RawConn
@@ -55,6 +56,7 @@ type ReadVReader struct {
 	alloc   allocStrategy
 }
 
+// NewReadVReader creates a new ReadVReader.
 func NewReadVReader(reader io.Reader, rawConn syscall.RawConn) *ReadVReader {
 	return &ReadVReader{
 		Reader:  reader,