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io_uring has been a game-changer for Samba IO speed.

Check out Stefan Metzmacher's talk at SambaXP 2021 (online event) for details:

The performance comparisons start here https://youtu.be/eYxp8yJHpik?t=1421

Looks like the bandwidth went from 3.8 GB/s to 22 GB/s, with the client being the bottleneck.