diff --git a/server/tso.go b/server/tso.go
index 2b3010178ea..aa4e3eb72cb 100644
--- a/server/tso.go
+++ b/server/tso.go
@@ -140,14 +140,14 @@ func (s *Server) updateTimestamp() error {
 	return nil
 }
 
-const maxRetryNum = 100
+const maxRetryCount = 100
 
 func (s *Server) getRespTS() *pdpb.Timestamp {
 	resp := &pdpb.Timestamp{}
-	for i := 0; i < maxRetryNum; i++ {
+	for i := 0; i < maxRetryCount; i++ {
 		current, ok := s.ts.Load().(*atomicObject)
 		if !ok {
-			log.Errorf("we haven't synced timestamp ok, wait and retry")
+			log.Errorf("we haven't synced timestamp ok, wait and retry, retry count %d", i)
 			time.Sleep(200 * time.Millisecond)
 			continue
 		}
@@ -155,7 +155,7 @@ func (s *Server) getRespTS() *pdpb.Timestamp {
 		resp.Physical = proto.Int64(int64(current.physical.UnixNano()) / 1e6)
 		resp.Logical = proto.Int64(atomic.AddInt64(&current.logical, 1))
 		if *resp.Logical >= maxLogical {
-			log.Errorf("logical part outside of max logical interval %v, please check ntp time", resp)
+			log.Errorf("logical part outside of max logical interval %v, please check ntp time, retry count %d", resp, i)
 			time.Sleep(50 * time.Millisecond)
 			continue
 		}