Performance is subjective, but let's dig into the performance optimization this patch includes. The update addresses an issue where to do a llseek (read) of the database, the linux kernel would lock the read, causing it to have only one output at a time. The patch removes the lock because it was unnecessary and thus the performance scales concurrently without a lock creating contention.

This kind of performance optimization isn't new, concurrency is the name of the game. Erlang is a language built around concurrency and it has some databases written in it (couchdb) that scale with more cores due to erlangs inherent capabilities. So has this kind of performance increase been seen before, yes.