diff --git a/internal/socket/messages.go b/internal/socket/messages.go
index 9c0e3ef..3452e25 100644
--- a/internal/socket/messages.go
+++ b/internal/socket/messages.go
@@ -1,38 +1,17 @@
 package socket
 
 import (
-	"github.com/php2go/netpollmux/internal/buffer"
 	"io"
 	"strings"
 	"sync"
 	"sync/atomic"
 
+	"github.com/php2go/netpollmux/internal/buffer"
 	"github.com/php2go/netpollmux/internal/writer"
 )
 
 const bufferSize = 65526
 
-var (
-	buffers = sync.Map{}
-	assign  int32
-)
-
-//func assignPool(size int) *sync.Pool {
-//	for {
-//		if p, ok := buffers.Load(size); ok {
-//			return p.(*sync.Pool)
-//		}
-//		if atomic.CompareAndSwapInt32(&assign, 0, 1) {
-//			var pool = &sync.Pool{New: func() interface{} {
-//				return make([]byte, size)
-//			}}
-//			buffers.Store(size, pool)
-//			atomic.StoreInt32(&assign, 0)
-//			return pool
-//		}
-//	}
-//}
-
 // Batch interface is used to write batch messages.
 type Batch interface {
 	// SetConcurrency sets a callback function concurrency to enable auto batch writer for improving throughput.
diff --git a/internal/socket/socket.go b/internal/socket/socket.go
index 371ebae..6665e32 100644
--- a/internal/socket/socket.go
+++ b/internal/socket/socket.go
@@ -5,14 +5,11 @@ import (
 	"errors"
 	"fmt"
 	"net"
-	"runtime"
 	"strings"
 
 	"github.com/php2go/netpollmux/netpoll"
 )
 
-var numCPU = runtime.NumCPU()
-
 // ErrHandler is the error when the handler is nil
 var ErrHandler = errors.New("handler is nil")
 
diff --git a/internal/socket/socket_http.go b/internal/socket/socket_http.go
index 58650a9..62427fb 100644
--- a/internal/socket/socket_http.go
+++ b/internal/socket/socket_http.go
@@ -5,11 +5,12 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
-	"github.com/php2go/netpollmux/netpoll"
 	"io"
 	"net"
 	"net/http"
 	"time"
+
+	"github.com/php2go/netpollmux/netpoll"
 )
 
 const (
diff --git a/internal/socket/socket_inproc.go b/internal/socket/socket_inproc.go
index 4e242af..695e0a0 100644
--- a/internal/socket/socket_inproc.go
+++ b/internal/socket/socket_inproc.go
@@ -2,9 +2,10 @@ package socket
 
 import (
 	"crypto/tls"
+	"net"
+
 	"github.com/php2go/netpollmux/internal/inproc"
 	"github.com/php2go/netpollmux/netpoll"
-	"net"
 )
 
 // INPROC implements the Socket interface.
diff --git a/test/netpoll_benchmark/server.go b/test/netpoll_benchmark/server.go
new file mode 100644
index 0000000..8821094
--- /dev/null
+++ b/test/netpoll_benchmark/server.go
@@ -0,0 +1,37 @@
+package netpoll_benchmark
+
+import (
+	"flag"
+	"time"
+
+	"github.com/php2go/netpollmux/netpoll"
+)
+
+var addr string
+var async bool
+var sleep int
+
+func init() {
+	flag.StringVar(&addr, "addr", ":9999", "-addr=:9999")
+	flag.BoolVar(&async, "async", false, "-async=false")
+	flag.IntVar(&sleep, "sleep", 0, "-sleep=0")
+	flag.Parse()
+}
+
+func main() {
+	var handler = &netpoll.DataHandler{
+		NoShared:   true,
+		NoCopy:     true,
+		BufferSize: 1024,
+		HandlerFunc: func(req []byte) (res []byte) {
+			if sleep > 0 {
+				time.Sleep(time.Millisecond * time.Duration(sleep))
+			}
+			res = req
+			return
+		},
+	}
+	if err := netpoll.ListenAndServe("tcp", addr, handler); err != nil {
+		panic(err)
+	}
+}