+/*
+ * Zone size with the malloc overhead (max of debug and release variants)
+ * must fit into the smallest supported hugepage size (2M),
+ * so that an IOVA-contiguous zone of this size can always be allocated
+ * if there are free 2M hugepages.
+ */
+#define EXTBUF_ZONE_SIZE (RTE_PGSIZE_2M - 4 * RTE_CACHE_LINE_SIZE)