diff --git a/common/alloc/buffer.go b/common/alloc/buffer.go
index ed5c21315..821808218 100644
--- a/common/alloc/buffer.go
+++ b/common/alloc/buffer.go
@@ -5,10 +5,6 @@ import (
 	"io"
 )
 
-const (
-	defaultOffset = 16
-)
-
 // BytesWriter is a writer that writes contents into the given buffer.
 type BytesWriter func([]byte) int
 
@@ -28,8 +24,8 @@ func CreateBuffer(container []byte, parent Pool) *Buffer {
 	b := new(Buffer)
 	b.v = container
 	b.pool = parent
-	b.start = defaultOffset
-	b.end = defaultOffset
+	b.start = 0
+	b.end = 0
 	return b
 }
 
@@ -48,14 +44,8 @@ func (b *Buffer) Release() {
 // Clear clears the content of the buffer, results an empty buffer with
 // Len() = 0.
 func (b *Buffer) Clear() {
-	b.start = defaultOffset
-	b.end = defaultOffset
-}
-
-// Reset resets this Buffer into its original state.
-func (b *Buffer) Reset() {
-	b.start = defaultOffset
-	b.end = len(b.v)
+	b.start = 0
+	b.end = 0
 }
 
 // AppendBytes appends one or more bytes to the end of the buffer.
@@ -75,23 +65,6 @@ func (b *Buffer) AppendFunc(writer BytesWriter) {
 	b.end += nBytes
 }
 
-// Prepend prepends bytes in front of the buffer. Caller must ensure total bytes prepended is
-// no more than 16 bytes.
-func (b *Buffer) Prepend(data []byte) {
-	b.SliceBack(len(data))
-	copy(b.v[b.start:], data)
-}
-
-// PrependBytes prepends all data in front of the buffer.
-func (b *Buffer) PrependBytes(data ...byte) {
-	b.Prepend(data)
-}
-
-func (b *Buffer) PrependFunc(offset int, writer BytesWriter) {
-	b.SliceBack(offset)
-	writer(b.v[b.start:])
-}
-
 // Byte returns the bytes at index.
 func (b *Buffer) Byte(index int) byte {
 	return b.v[b.start+index]
@@ -108,7 +81,7 @@ func (b *Buffer) Bytes() []byte {
 }
 
 func (b *Buffer) SetBytesFunc(writer BytesWriter) {
-	b.start = defaultOffset
+	b.start = 0
 	b.end = b.start + writer(b.v[b.start:])
 }
 
@@ -160,15 +133,6 @@ func (b *Buffer) SliceFrom(from int) {
 	b.start += from
 }
 
-// SliceBack extends the Buffer to its front by offset bytes.
-// Caller must ensure cumulated offset is no more than 16.
-func (b *Buffer) SliceBack(offset int) {
-	b.start -= offset
-	if b.start < 0 {
-		panic("Negative buffer offset.")
-	}
-}
-
 // Len returns the length of the buffer content.
 func (b *Buffer) Len() int {
 	if b == nil {
diff --git a/common/alloc/buffer_pool.go b/common/alloc/buffer_pool.go
index 6c7d66bce..e305d72b1 100644
--- a/common/alloc/buffer_pool.go
+++ b/common/alloc/buffer_pool.go
@@ -84,11 +84,8 @@ func (p *BufferPool) Free(buffer *Buffer) {
 }
 
 const (
-	mediumBufferByteSize = 8 * 1024
-	BufferSize           = mediumBufferByteSize - defaultOffset
-
-	smallBufferByteSize = 2 * 1024
-	SmallBufferSize     = smallBufferByteSize - defaultOffset
+	BufferSize      = 8 * 1024
+	SmallBufferSize = 2 * 1024
 
 	PoolSizeEnvKey = "v2ray.buffer.size"
 )
@@ -109,8 +106,8 @@ func init() {
 	}
 	if size > 0 {
 		totalByteSize := size * 1024 * 1024
-		mediumPool = NewBufferPool(mediumBufferByteSize, totalByteSize/mediumBufferByteSize)
+		mediumPool = NewBufferPool(BufferSize, totalByteSize/BufferSize)
 	} else {
-		mediumPool = NewSyncPool(mediumBufferByteSize)
+		mediumPool = NewSyncPool(BufferSize)
 	}
 }
diff --git a/common/alloc/buffer_test.go b/common/alloc/buffer_test.go
index 8d00985de..6c0492566 100644
--- a/common/alloc/buffer_test.go
+++ b/common/alloc/buffer_test.go
@@ -31,22 +31,6 @@ func TestBufferIsEmpty(t *testing.T) {
 	assert.Bool(buffer.IsEmpty()).IsTrue()
 }
 
-func TestBufferPrepend(t *testing.T) {
-	assert := assert.On(t)
-
-	buffer := NewBuffer()
-	defer buffer.Release()
-
-	buffer.Append([]byte{'a', 'b', 'c'})
-	buffer.Prepend([]byte{'x', 'y', 'z'})
-
-	assert.Int(buffer.Len()).Equals(6)
-	assert.String(buffer.String()).Equals("xyzabc")
-
-	buffer.Prepend([]byte{'u', 'v', 'w'})
-	assert.String(buffer.String()).Equals("uvwxyzabc")
-}
-
 func TestBufferString(t *testing.T) {
 	assert := assert.On(t)
 
@@ -60,7 +44,7 @@ func TestBufferString(t *testing.T) {
 func TestBufferWrite(t *testing.T) {
 	assert := assert.On(t)
 
-	buffer := NewLocalBuffer(24) // 16 + 8
+	buffer := NewLocalBuffer(8)
 	nBytes, err := buffer.Write([]byte("abcd"))
 	assert.Error(err).IsNil()
 	assert.Int(nBytes).Equals(4)
diff --git a/proxy/vmess/inbound/inbound.go b/proxy/vmess/inbound/inbound.go
index 4f7fdca89..f305b679c 100644
--- a/proxy/vmess/inbound/inbound.go
+++ b/proxy/vmess/inbound/inbound.go
@@ -225,7 +225,7 @@ func (v *VMessInboundHandler) HandleConnection(connection internet.Connection) {
 	}
 	output.Release()
 	if request.Option.Has(protocol.RequestOptionChunkStream) {
-		if err := bodyWriter.Write(alloc.NewLocalBuffer(32)); err != nil {
+		if err := bodyWriter.Write(alloc.NewLocalBuffer(8)); err != nil {
 			connection.SetReusable(false)
 		}
 	}
diff --git a/proxy/vmess/outbound/outbound.go b/proxy/vmess/outbound/outbound.go
index 1f2b143e0..314ab2c05 100644
--- a/proxy/vmess/outbound/outbound.go
+++ b/proxy/vmess/outbound/outbound.go
@@ -116,7 +116,7 @@ func (v *VMessOutboundHandler) handleRequest(session *encoding.ClientSession, co
 	}
 
 	if request.Option.Has(protocol.RequestOptionChunkStream) {
-		err := bodyWriter.Write(alloc.NewLocalBuffer(32))
+		err := bodyWriter.Write(alloc.NewLocalBuffer(8))
 		if err != nil {
 			conn.SetReusable(false)
 		}