On Fri, Nov 27, 2015 at 9:14 PM, Christoph Anton Mitterer
<cales...@scientia.net> wrote:

> - Bust most importantly,... if the reason was SMR, why should always
> when no IO happens dmcrypt_write be at basically full CPU.

It sounds to me like maybe LUKS is configured to use an encryption
algorithm that isn't subject to CPU optimized support, e.g. aes-xts on
my laptop gets 1600MiB/s where serpent-cbc gets only 68MiB/s and pegs
the CPU. This is reported by 'cryptsetup benchmark'

-- 
Chris Murphy
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