diff --git a/internal/client/client_batch.go b/internal/client/client_batch.go
index 632d6f30..b7159847 100644
--- a/internal/client/client_batch.go
+++ b/internal/client/client_batch.go
@@ -37,6 +37,7 @@ package client
 
 import (
 	"context"
+	"fmt"
 	"math"
 	"runtime/trace"
 	"sync"
@@ -793,7 +794,8 @@ func sendBatchRequest(
 	case <-timer.C:
 		return nil, errors.WithMessage(context.DeadlineExceeded, "wait sendLoop")
 	}
-	metrics.TiKVBatchWaitDuration.Observe(float64(time.Since(start)))
+	waitDuration := time.Since(start)
+	metrics.TiKVBatchWaitDuration.Observe(float64(waitDuration))
 
 	select {
 	case res, ok := <-entry.res:
@@ -808,7 +810,8 @@ func sendBatchRequest(
 		return nil, errors.WithStack(ctx.Err())
 	case <-timer.C:
 		atomic.StoreInt32(&entry.canceled, 1)
-		return nil, errors.WithMessage(context.DeadlineExceeded, "wait recvLoop")
+		reason := fmt.Sprintf("wait recvLoop timeout,timeout:%s, wait_duration:%s:", timeout, waitDuration)
+		return nil, errors.WithMessage(context.DeadlineExceeded, reason)
 	}
 }
 
diff --git a/internal/locate/region_request.go b/internal/locate/region_request.go
index 449db7be..33d56cba 100644
--- a/internal/locate/region_request.go
+++ b/internal/locate/region_request.go
@@ -113,7 +113,7 @@ type RegionRequestSender struct {
 }
 
 func (s *RegionRequestSender) String() string {
-	return fmt.Sprintf("{replicaSelector: %v}", s.replicaSelector.String())
+	return fmt.Sprintf("{rpcError:%v,replicaSelector: %v}", s.rpcError, s.replicaSelector.String())
 }
 
 // RegionRequestRuntimeStats records the runtime stats of send region requests.