diff --git a/cpp/conf/server_config.template b/cpp/conf/server_config.template
index c7eb134f0d..cb99749784 100644
--- a/cpp/conf/server_config.template
+++ b/cpp/conf/server_config.template
@@ -34,5 +34,5 @@ cache_config:           # cache configure
 
 engine_config:
   nprobe: 10
-  nlist: 16381
-  use_blas_threshold: 10
\ No newline at end of file
+  nlist: 16384
+  use_blas_threshold: 20
\ No newline at end of file