diff --git a/weed/command/benchmark.go b/weed/command/benchmark.go
index 41aadc6db..7f132892e 100644
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@@ -41,7 +41,6 @@ type BenchmarkOptions struct {
 	grpcDialOption   grpc.DialOption
 	masterClient     *wdclient.MasterClient
 	fsync            *bool
-	useTcp           *bool
 }
 
 var (
@@ -68,7 +67,6 @@ func init() {
 	b.cpuprofile = cmdBenchmark.Flag.String("cpuprofile", "", "cpu profile output file")
 	b.maxCpu = cmdBenchmark.Flag.Int("maxCpu", 0, "maximum number of CPUs. 0 means all available CPUs")
 	b.fsync = cmdBenchmark.Flag.Bool("fsync", false, "flush data to disk after write")
-	b.useTcp = cmdBenchmark.Flag.Bool("useTcp", false, "send data via tcp")
 	sharedBytes = make([]byte, 1024)
 }
 
@@ -225,8 +223,6 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {
 
 	random := rand.New(rand.NewSource(time.Now().UnixNano()))
 
-	volumeTcpClient := wdclient.NewVolumeTcpClient()
-
 	for id := range idChan {
 		start := time.Now()
 		fileSize := int64(*b.fileSize + random.Intn(64))
@@ -247,15 +243,7 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {
 			if !isSecure && assignResult.Auth != "" {
 				isSecure = true
 			}
-			if *b.useTcp {
-				if uploadByTcp(volumeTcpClient, fp) {
-					fileIdLineChan <- fp.Fid
-					s.completed++
-					s.transferred += fileSize
-				} else {
-					s.failed++
-				}
-			} else if _, err := fp.Upload(0, b.masterClient.GetMaster, false, assignResult.Auth, b.grpcDialOption); err == nil {
+			if _, err := fp.Upload(0, b.masterClient.GetMaster, false, assignResult.Auth, b.grpcDialOption); err == nil {
 				if random.Intn(100) < *b.deletePercentage {
 					s.total++
 					delayedDeleteChan <- &delayedFile{time.Now().Add(time.Second), fp}
@@ -341,17 +329,6 @@ func writeFileIds(fileName string, fileIdLineChan chan string, finishChan chan b
 	}
 }
 
-func uploadByTcp(volumeTcpClient *wdclient.VolumeTcpClient, fp *operation.FilePart) bool {
-
-	err := volumeTcpClient.PutFileChunk(fp.Server, fp.Fid, uint32(fp.FileSize), fp.Reader)
-	if err != nil {
-		glog.Errorf("upload chunk err: %v", err)
-		return false
-	}
-
-	return true
-}
-
 func readFileIds(fileName string, fileIdLineChan chan string) {
 	file, err := os.Open(fileName) // For read access.
 	if err != nil {
diff --git a/weed/wdclient/volume_tcp_client.go b/weed/wdclient/volume_tcp_client.go
deleted file mode 100644
index d7ea81d64..000000000
--- a/weed/wdclient/volume_tcp_client.go
+++ /dev/null
@@ -1,97 +0,0 @@
-package wdclient
-
-import (
-	"bufio"
-	"bytes"
-	"fmt"
-	"github.com/seaweedfs/seaweedfs/weed/glog"
-	"github.com/seaweedfs/seaweedfs/weed/pb"
-	"github.com/seaweedfs/seaweedfs/weed/util"
-	"github.com/seaweedfs/seaweedfs/weed/wdclient/net2"
-	"io"
-	"net"
-	"time"
-)
-
-// VolumeTcpClient put/get/delete file chunks directly on volume servers without replication
-type VolumeTcpClient struct {
-	cp net2.ConnectionPool
-}
-
-type VolumeTcpConn struct {
-	net.Conn
-	bufWriter *bufio.Writer
-	bufReader *bufio.Reader
-}
-
-func NewVolumeTcpClient() *VolumeTcpClient {
-	MaxIdleTime := 10 * time.Second
-	return &VolumeTcpClient{
-		cp: net2.NewMultiConnectionPool(net2.ConnectionOptions{
-			MaxActiveConnections: 16,
-			MaxIdleConnections:   1,
-			MaxIdleTime:          &MaxIdleTime,
-			DialMaxConcurrency:   0,
-			Dial: func(network string, address string) (net.Conn, error) {
-				conn, err := net.Dial(network, address)
-				return &VolumeTcpConn{
-					conn,
-					bufio.NewWriter(conn),
-					bufio.NewReader(conn),
-				}, err
-			},
-			NowFunc:      nil,
-			ReadTimeout:  0,
-			WriteTimeout: 0,
-		}),
-	}
-}
-func (c *VolumeTcpClient) PutFileChunk(volumeServerAddress string, fileId string, fileSize uint32, fileReader io.Reader) (err error) {
-
-	tcpAddress, parseErr := pb.ParseServerAddress(volumeServerAddress, 20000)
-	if parseErr != nil {
-		return parseErr
-	}
-
-	c.cp.Register("tcp", tcpAddress)
-	tcpConn, getErr := c.cp.Get("tcp", tcpAddress)
-	if getErr != nil {
-		return fmt.Errorf("get connection to %s: %v", tcpAddress, getErr)
-	}
-	conn := tcpConn.RawConn().(*VolumeTcpConn)
-	defer func() {
-		if err != nil {
-			tcpConn.DiscardConnection()
-		} else {
-			tcpConn.ReleaseConnection()
-		}
-	}()
-
-	buf := []byte("+" + fileId + "\n")
-	_, err = conn.bufWriter.Write([]byte(buf))
-	if err != nil {
-		return
-	}
-	util.Uint32toBytes(buf[0:4], fileSize)
-	_, err = conn.bufWriter.Write(buf[0:4])
-	if err != nil {
-		return
-	}
-	_, err = io.Copy(conn.bufWriter, fileReader)
-	if err != nil {
-		return
-	}
-	conn.bufWriter.Write([]byte("!\n"))
-	conn.bufWriter.Flush()
-
-	ret, _, err := conn.bufReader.ReadLine()
-	if err != nil {
-		glog.V(0).Infof("upload by tcp: %v", err)
-		return
-	}
-	if !bytes.HasPrefix(ret, []byte("+OK")) {
-		glog.V(0).Infof("upload by tcp: %v", string(ret))
-	}
-
-	return nil
-}