diff --git a/src/backend/storage/ipc/dsm.c b/src/backend/storage/ipc/dsm.c
index 9bf16de940..40a1e46fc0 100644
--- a/src/backend/storage/ipc/dsm.c
+++ b/src/backend/storage/ipc/dsm.c
@@ -45,13 +45,8 @@
 
 #define PG_DYNSHMEM_CONTROL_MAGIC		0x9a503d32
 
-/*
- * There's no point in getting too cheap here, because the minimum allocation
- * is one OS page, which is probably at least 4KB and could easily be as high
- * as 64KB.  Each currently sizeof(dsm_control_item), currently 8 bytes.
- */
 #define PG_DYNSHMEM_FIXED_SLOTS			64
-#define PG_DYNSHMEM_SLOTS_PER_BACKEND	2
+#define PG_DYNSHMEM_SLOTS_PER_BACKEND	5
 
 #define INVALID_CONTROL_SLOT		((uint32) -1)
 
diff --git a/src/backend/utils/mmgr/dsa.c b/src/backend/utils/mmgr/dsa.c
index 900cd8357c..5a53c8290a 100644
--- a/src/backend/utils/mmgr/dsa.c
+++ b/src/backend/utils/mmgr/dsa.c
@@ -74,7 +74,7 @@
  * dsm.c's limits on total number of segments), or limiting the total size
  * an area can manage when using small pointers.
  */
-#define DSA_NUM_SEGMENTS_AT_EACH_SIZE 4
+#define DSA_NUM_SEGMENTS_AT_EACH_SIZE 2
 
 /*
  * The number of bits used to represent the offset part of a dsa_pointer.