Portal:DeveloperDocs/set internals

nft_set_type	nft_set_types[] order	NFT_SET_INTERVAL	NFT_SET_MAP	NFT_SET_TIMEOUT	NFT_SET_OBJECT	NFT_SET_EVAL	Notes
nft_set_hash_fast_type	0	No	Yes	No	Yes	No
nft_set_hash_type	1	No	Yes	No	Yes	No
nft_set_rhash_type	2	No	Yes	Yes	Yes	Yes
nft_set_bitmap_type	3	No	No	No	No	No
nft_set_rbtree_type	4	Yes	Yes	Yes	Yes	No
nft_set_pipapo_avx2_type	5	Yes	Yes	Yes	Yes	No
nft_set_pipapo_type	6	Yes	Yes	Yes	Yes	No

If two nft_set_types have the same estimated lookup time and same estimated space requirement, the type that appears first in nft_set_types[] is chosen.