diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index fd116158d008..2d58d4b8a918 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -40,7 +40,7 @@ show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, size_t span)
 	ksft_print_msg("%s Check MBM diff within %d%%\n",
 		       ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT);
 	ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
-	ksft_print_msg("Span (MB): %zu\n", span);
+	ksft_print_msg("Span (MB): %zu\n", span / MB);
 	ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
 	ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
 
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index bae8f205fc3f..3a65dacb441e 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -185,8 +185,8 @@ int main(int argc, char **argv)
 	char benchmark_cmd_area[BENCHMARK_ARGS][BENCHMARK_ARG_SIZE];
 	int c, cpu_no = 1, argc_new = argc, i, no_of_bits = 0;
 	int ben_ind, ben_count, tests = 0;
+	size_t span = 250 * MB;
 	bool cat_test = true;
-	size_t span = 250;
 
 	for (i = 0; i < argc; i++) {
 		if (strcmp(argv[i], "-b") == 0) {
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 14fb85a7e526..6c00e79df033 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -303,9 +303,9 @@ int taskset_benchmark(pid_t bm_pid, int cpu_no)
 void run_benchmark(int signum, siginfo_t *info, void *ucontext)
 {
 	int operation, ret, malloc_and_init_memory, memflush;
-	size_t span, buffer_span;
 	char **benchmark_cmd;
 	char resctrl_val[64];
+	size_t span;
 	FILE *fp;
 
 	benchmark_cmd = info->si_ptr;
@@ -326,12 +326,7 @@ void run_benchmark(int signum, siginfo_t *info, void *ucontext)
 		operation = atoi(benchmark_cmd[4]);
 		sprintf(resctrl_val, "%s", benchmark_cmd[5]);
 
-		if (strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR)))
-			buffer_span = span * MB;
-		else
-			buffer_span = span;
-
-		if (run_fill_buf(buffer_span, malloc_and_init_memory, memflush,
+		if (run_fill_buf(span, malloc_and_init_memory, memflush,
 				 operation, resctrl_val))
 			fprintf(stderr, "Error in running fill buffer\n");
 	} else {