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On Tue, 12 Dec 2017 12:18:23 +0000, Wols Lists wrote: |
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> > That means every write has to be encrypted 4 times, whereas using |
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> > encryption in the filesystem means it only has to be done once. I |
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> > tried setting encrypted BTRFS this way and there was a significant |
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> > performance hit. I'm seriously considering going back to ZoL now that |
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> > encryption is on the way. |
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> |
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> DISCLAIMER - I DON'T HAVE A CLUE HOW THIS ACTUALLY WORKS IN DETAIL |
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> |
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> but there's been a fair few posts on LKML sublists about how linux is |
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> very inefficient at using hardware encryption. Setup/teardown is |
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> expensive, and it only encrypts in small disk-size blocks, so somebody's |
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> been trying to make it encrypt in file-system-sized chunks. When/if they |
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> get this working, you'll probably notice a speedup of the order of 90% |
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> or so ... |
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This isn't so much a matter of hardware vs. software encryption, more |
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that encrypting below the RAID level means everything has to be encrypted |
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multiple times. |
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-- |
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Neil Bothwick |
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There's no place like ~ |
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