diff --git a/wally/suits/io/check_linearity.cfg b/wally/suits/io/check_linearity.cfg
index 670e8b3..f7c37fb 100644
--- a/wally/suits/io/check_linearity.cfg
+++ b/wally/suits/io/check_linearity.cfg
@@ -1,33 +1,26 @@
-[defaults]
+[global]
+
+include defaults.cfg
 NUM_ROUNDS=7
 
-# this is critical for correct results in multy-node run
-randrepeat=0
-
-ramp_time=5
-buffered=0
-wait_for_previous
-filename={FILENAME}
-iodepth=1
-size=10G
-time_based
+size={TEST_FILE_SIZE}
 ramp_time=5
 runtime=30
 
 # ---------------------------------------------------------------------
 # check read and write linearity. oper_time = func(size)
 # ---------------------------------------------------------------------
-[linearity_test_{TEST_SUMM} * {NUM_ROUNDS}]
-blocksize={% 512, 1k, 4k, 8k, 16k, 32k, 64k, 128k, 256k, 512k, 1m, 2m, 4m %}
-rw={% randwrite, randread %}
-direct=1
+# [linearity_test_{TEST_SUMM}]
+# blocksize={BLOCK_SIZES}
+# rw={% randwrite, randread %}
+# direct=1
 
 # ---------------------------------------------------------------------
 # check sync write linearity. oper_time = func(size)
 # check sync BW as well
 # ---------------------------------------------------------------------
-[linearity_test_{TEST_SUMM} * {NUM_ROUNDS}]
-blocksize={% 512, 1k, 4k, 8k, 16k, 32k, 64k, 128k, 256k, 512k, 1m, 2m, 4m %}
+[linearity_test_{TEST_SUMM}]
+blocksize={BLOCK_SIZES}
 rw=randwrite
 sync=1