On 12/12/17 10:15, Neil Bothwick wrote: > That means every write has to be encrypted 4 times, whereas using > encryption in the filesystem means it only has to be done once. I tried > setting encrypted BTRFS this way and there was a significant performance > hit. I'm seriously considering going back to ZoL now that encryption is > on the way.
DISCLAIMER - I DON'T HAVE A CLUE HOW THIS ACTUALLY WORKS IN DETAIL but there's been a fair few posts on LKML sublists about how linux is very inefficient at using hardware encryption. Setup/teardown is expensive, and it only encrypts in small disk-size blocks, so somebody's been trying to make it encrypt in file-system-sized chunks. When/if they get this working, you'll probably notice a speedup of the order of 90% or so ... Cheers, Wol
