diff --git a/src/test/modules/test_sort_perf/make-itemptr-tests.sh b/src/test/modules/test_sort_perf/make-itemptr-tests.sh
index 9151ea703f..fd0048eba3 100755
--- a/src/test/modules/test_sort_perf/make-itemptr-tests.sh
+++ b/src/test/modules/test_sort_perf/make-itemptr-tests.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # different values to test for insertion sorts
-THRESHOLDS="7 8 9 10 11 12 13"
+THRESHOLDS="7 12 16 32"
 
 # amount of data to sort, in megabytes
 MEMORY=128
@@ -18,10 +18,9 @@ for threshold in $THRESHOLDS ; do
   echo "#define ST_DEFINE"
   echo "#include \"lib/sort_template.h\""
   echo
-  echo "#define ST_SORT sort64_${threshold}_itemptr"
+  echo "#define ST_SORT sort_ids_${threshold}_itemptr"
   echo "#define ST_ELEMENT_TYPE ItemPointerData"
-  echo "#define ST_COMPARE(a, b) (itemptr_encode(a) - itemptr_encode(b))"
-  echo "#define ST_COMPARE_RET_TYPE int64"
+  echo "#define ST_COMPARE(a, b) itemptr_comparator_blockids(a, b)"
   echo "#define ST_SCOPE static"
   echo "#define ST_SORT_SMALL_THRESHOLD $threshold"
   echo "#define ST_CHECK_FOR_INTERRUPTS"
@@ -76,7 +75,7 @@ for order in random increasing decreasing ; do
     echo "        sort_${threshold}_itemptr(sorted, nobjects);"
     echo "        INSTR_TIME_SET_CURRENT(end_time);"
     echo "        INSTR_TIME_SUBTRACT(end_time, start_time);"
-    echo "        elog(NOTICE, \"order=$order, threshold=$threshold, cmp=32, test=%d, time=%f\", i, INSTR_TIME_GET_DOUBLE(end_time));"
+    echo "        elog(NOTICE, \"order=$order, threshold=$threshold, cmp=std, test=%d, time=%f\", i, INSTR_TIME_GET_DOUBLE(end_time));"
     echo "    }"
     echo "    for (int i = 0; i < 3; ++i)"
     echo "    {"
@@ -84,10 +83,10 @@ for order in random increasing decreasing ; do
     echo "        memcpy(sorted, unsorted, sizeof(sorted[0]) * nobjects);"
     echo "        INSTR_TIME_SET_CURRENT(start_time);"
     echo "        memcpy(sorted, unsorted, sizeof(sorted[0]) * nobjects);"
-    echo "        sort64_${threshold}_itemptr(sorted, nobjects);"
+    echo "        sort_ids_${threshold}_itemptr(sorted, nobjects);"
     echo "        INSTR_TIME_SET_CURRENT(end_time);"
     echo "        INSTR_TIME_SUBTRACT(end_time, start_time);"
-    echo "        elog(NOTICE, \"order=$order, threshold=$threshold, cmp=64, test=%d, time=%f\", i, INSTR_TIME_GET_DOUBLE(end_time));"
+    echo "        elog(NOTICE, \"order=$order, threshold=$threshold, cmp=ids, test=%d, time=%f\", i, INSTR_TIME_GET_DOUBLE(end_time));"
     echo "    }"
   done
 done
diff --git a/src/test/modules/test_sort_perf/test_sort_perf.c b/src/test/modules/test_sort_perf/test_sort_perf.c
index 05a10924f3..1ebaf41329 100644
--- a/src/test/modules/test_sort_perf/test_sort_perf.c
+++ b/src/test/modules/test_sort_perf/test_sort_perf.c
@@ -8,6 +8,44 @@
 
 #include <stdlib.h>
 
+/*
+ * ItemPointerGetBlockIdHiNoCheck
+ *		Returns the high short of a disk item pointer blockid.
+ */
+#define ItemPointerGetBlockIdHiNoCheck(pointer) \
+( \
+	(pointer)->ip_blkid.bi_hi \
+)
+
+/*
+ * ItemPointerGetBlockIdHi
+ *		As above, but verifies that the item pointer looks valid.
+ */
+#define ItemPointerGetBlockIdHi(pointer) \
+( \
+	AssertMacro(ItemPointerIsValid(pointer)), \
+	ItemPointerGetBlockIdHiNoCheck(pointer) \
+)
+
+/*
+ * ItemPointerGetBlockIdLoNoCheck
+ *		Returns the low short of a disk item pointer blockid.
+ */
+#define ItemPointerGetBlockIdLoNoCheck(pointer) \
+( \
+	(pointer)->ip_blkid.bi_lo \
+)
+
+/*
+ * ItemPointerGetBlockIdLo
+ *		As above, but verifies that the item pointer looks valid.
+ */
+#define ItemPointerGetBlockIdLo(pointer) \
+( \
+	AssertMacro(ItemPointerIsValid(pointer)), \
+	ItemPointerGetBlockIdHiNoCheck(pointer) \
+)
+
 static int
 itemptr_comparator(const void *a, const void *b)
 {
@@ -29,6 +67,38 @@ itemptr_comparator(const void *a, const void *b)
 	return 0;
 }
 
+static int
+itemptr_comparator_blockids(const void *a, const void *b)
+{
+	const ItemPointerData *ipa = (const ItemPointerData *) a;
+	const ItemPointerData *ipb = (const ItemPointerData *) b;
+
+	uint16 ba_hi = ItemPointerGetBlockIdHi(ipa);
+	uint16 bb_hi = ItemPointerGetBlockIdHi(ipb);
+
+	if (ba_hi < bb_hi)
+		return -1;
+	if (ba_hi > bb_hi)
+		return 1;
+
+	uint16 ba_lo = ItemPointerGetBlockIdLo(ipa);
+	uint16 bb_lo = ItemPointerGetBlockIdLo(ipb);
+
+	if (ba_lo < bb_lo)
+		return -1;
+	if (ba_lo > bb_lo)
+		return 1;
+
+	OffsetNumber oa = ItemPointerGetOffsetNumber(ipa);
+	OffsetNumber ob = ItemPointerGetOffsetNumber(ipb);
+
+	if (oa < ob)
+		return -1;
+	if (oa > ob)
+		return 1;
+	return 0;
+}
+
 PG_MODULE_MAGIC;
 
 /* include the generated code */