diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index cc368167f810d2254627a13d43d8114d919605f5..c5646d92d1ee23000e5848129a81249c16737dd8 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -60,7 +60,7 @@ int32_t tsNumOfQnodeQueryThreads = 4;
 int32_t tsNumOfQnodeFetchThreads = 1;
 int32_t tsNumOfSnodeStreamThreads = 4;
 int32_t tsNumOfSnodeWriteThreads = 1;
-int32_t tsMaxStreamBackendCache = 256;  // M
+int32_t tsMaxStreamBackendCache = 128;  // M
 
 // sync raft
 int32_t tsElectInterval = 25 * 1000;