diff --git a/wally/suits/io/check_linearity.cfg b/wally/suits/io/check_linearity.cfg
index 6af5fcc..42618d4 100644
--- a/wally/suits/io/check_linearity.cfg
+++ b/wally/suits/io/check_linearity.cfg
@@ -1,9 +1,7 @@
 [global]
-
 include defaults.cfg
-NUM_ROUNDS=7
 
-size={TEST_FILE_SIZE}
+direct=1
 ramp_time=5
 runtime=30
 BLOCK_SIZES={% 512,1k,2k,4k,8k,16k,32k,128k,256k,512k,1m %}
@@ -11,10 +9,9 @@
 # ---------------------------------------------------------------------
 # check read and write linearity. oper_time = func(size)
 # ---------------------------------------------------------------------
-# [linearity_test_{TEST_SUMM}]
-# blocksize={BLOCK_SIZES}
-# rw={% randwrite, randread %}
-# direct=1
+[linearity_test_{TEST_SUMM}]
+blocksize={BLOCK_SIZES}
+rw=randread
 
 # ---------------------------------------------------------------------
 # check sync write linearity. oper_time = func(size)