add mixed load test, other fixes
diff --git a/wally/suits/io/defaults.cfg b/wally/suits/io/defaults.cfg
index 9aff22c..8c8644b 100644
--- a/wally/suits/io/defaults.cfg
+++ b/wally/suits/io/defaults.cfg
@@ -1,6 +1,7 @@
 buffered=0
 group_reporting=1
 iodepth=1
+unified_rw_reporting=1
 
 norandommap=1