diff --git a/weed/mount/weedfs_stats.go b/weed/mount/weedfs_stats.go
index 1b47e5d86..28e992158 100644
--- a/weed/mount/weedfs_stats.go
+++ b/weed/mount/weedfs_stats.go
@@ -10,7 +10,7 @@ import (
 	"time"
 )
 
-const blockSize = 4096 * 4
+const blockSize = 512
 
 type statsCache struct {
 	filer_pb.StatisticsResponse