Just speculating but perhaps the consumer ones return after the cache is populated and not after the data is durably on disk? That wouldn’t really be a no-op bu

Just speculating but perhaps the consumer ones return after the cache is populated and not after the data is durably on disk? That wouldn’t really be a no-op but would be much quicker for small writes at the expense of correctness in a power outage (although in the case of a DB the WAL entries are typically atomic so it would just be a rollback anyway).