diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index 3b3af3d0de..e75cd51fc0 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -492,7 +492,7 @@ int32_t transUtilSWhiteListToStr(SIpWhiteList* pWhiteList, char** ppBuf);
 
 enum { REQ_STATUS_INIT = 0, REQ_STATUS_PROCESSING };
 
-#define BUFFER_LIMIT        1
+#define BUFFER_LIMIT        4
 #define HEAP_MISS_HIT_LIMIT 100000
 #define READ_TIMEOUT        100000
 
diff --git a/tests/script/tsim/tagindex/sma_and_tag_index.sim b/tests/script/tsim/tagindex/sma_and_tag_index.sim
index 77cc9f53f9..4a6a948e21 100644
--- a/tests/script/tsim/tagindex/sma_and_tag_index.sim
+++ b/tests/script/tsim/tagindex/sma_and_tag_index.sim
@@ -96,6 +96,7 @@ while $i < 5
   sql drop index $sma
 endw
 
+#sleep 5000
 sql drop stable $mtPrefix
 sql select * from information_schema.ins_indexes
 if $rows != 0 then