Comment by marcan_42
4 years ago
The OS does not matter; it's strictly about the drive. macOS on a non-Apple SSD should be equally fast with F_FULLSYNC.
Indeed, I would very much like to know what on earth the ANS firmware is doing on flushes to make them so hideously slow. We do have the firmware blobs (for both the NVMe/ANS side and the downstream S5C NAND device controllers), so if someone is bored enough they could try to reverse engineer it... it also seems there's a bunch of debug mode options, so maybe we can even get some logs at some point.
Drives are known to ignore that hint... Thats why you should use vendor approved hardware if such things matter to you.