diff --git a/apps/maprobe/latency-test.c b/apps/maprobe/latency-test.c
index fa81843398a6406da10f63e59a0e2ddc97e85630..f72cd949ef8e0f4aa350201759cd97a536c6d27a 100644
--- a/apps/maprobe/latency-test.c
+++ b/apps/maprobe/latency-test.c
@@ -322,6 +322,15 @@ float test_random_access_latency(uint64_t num_access, uint64_t test_range, uint6
     register uint64_t result = 0; 
     // _perf_print_timer();
 
+    uint64_t total_access = num_access * iter;
+    if (test_range > total_access*8*_PERF_CACHELINE_SIZE_BYTE) {
+        printf("total access size %ldKB less than test range %ldKB, ignored\n",
+            total_access*8*_PERF_CACHELINE_SIZE_BYTE/KB,
+            test_range/KB
+        );
+        return 0;
+    }
+
     // alloc memory for random access addr array and data
     assert(test_align >= 8 * BYTE);
     // assert(size >= test_align);
@@ -347,13 +356,12 @@ float test_random_access_latency(uint64_t num_access, uint64_t test_range, uint6
         _perf_end_timer();
     }
     // _perf_print_timer();
-    uint64_t total_access = num_access * iter;
     float acpa = (float)perf.cycle / total_access; // average cycle per access
     if (to_csv) {
         printf("%ld, %f, %d, %ld, %ld\n", test_range, acpa, iter, total_access, perf.cycle);
     } else {
-        printf("range %ldKB, access cover %ldKB (%d iters) random read latency %f, throughput %f B/cycle (%ld samples, %ld cycles), align %ldB, %s\n", 
-            test_range/KB, total_access*8*_PERF_CACHELINE_SIZE_BYTE/KB, iter, acpa, total_access * 8 * BYTE / (float)perf.cycle, total_access, perf.cycle, test_align,
+        printf("range %ldKB, access %ldKB (cover %ldKB) (%d iters) random read latency %f, throughput %f B/cycle (%ld samples, %ld cycles), align %ldB, %s\n", 
+            test_range/KB, total_access*8*BYTE/KB,  total_access*8*_PERF_CACHELINE_SIZE_BYTE/KB, iter, acpa, total_access * 8 * BYTE / (float)perf.cycle, total_access, perf.cycle, test_align,
             pregen_addr ? "pregen addr" : "runtime addr"
         );
     }
diff --git a/apps/maprobe/main.c b/apps/maprobe/main.c
index 28c7eb12e17b0390c09a464e556a2f4ba4197ec2..eb973e7ba6a763330f7fecb0757c8bd6127f477d 100644
--- a/apps/maprobe/main.c
+++ b/apps/maprobe/main.c
@@ -187,6 +187,8 @@ void latency_test_example()
 
 void l2_l3_pressure_test()
 {
+    _perf_calibrate();
+    printf("L2 and L3 same set pressure test:\n");
     for (int i = 1; i < 16; i++) {
         printf("ways accessed: %d\n", i);
         test_linear_access_latency_simple(_PERF_ADDR_STRIDE_L2_SAME_SET*i,_PERF_ADDR_STRIDE_L2_SAME_SET,64,0);
@@ -240,7 +242,7 @@ int main()
     generate_linear_access_latency_matrix(_PERF_CACHELINE_SIZE_BYTE);
     generate_pointer_tracing_latency_matrix(8*BYTE);
     generate_pointer_tracing_latency_matrix(_PERF_CACHELINE_SIZE_BYTE);
-    generate_random_access_latency_matrix();
+    // generate_random_access_latency_matrix();
     generate_replacement_test_matrix();
 
     // matrix_print_example();