Reuse buffers on socket pumping

proxy/copy_pool.go

@@ -0,0 +1,16 @@
+package proxy
+
+import "sync"
+
+const copyBufferSize = 30 * 1024
+
+var copyPool sync.Pool
+
+func init() {
+	copyPool = sync.Pool{
+		New: func() interface{} {
+			data := make([]byte, copyBufferSize)
+			return &data
+		},
+	}
+}