fix test case on arm

common/buf/reader_test.go

@@ -3,6 +3,7 @@ package buf_test
 import (
 	"bytes"
 	"io"
+	"runtime"
 	"testing"
 
 	. "v2ray.com/core/common/buf"
@@ -11,6 +12,11 @@ import (
 )
 
 func TestAdaptiveReader(t *testing.T) {
+	if runtime.GOARCH != "amd64" {
+		t.Skip("Smart reader only works on highend devices.")
+		return
+	}
+
 	assert := With(t)
 
 	reader := NewReader(bytes.NewReader(make([]byte, 1024*1024)))