[dm-crypt] IO performance implications using dm-crypt

Hello All,

I've been searching for information with regards to performance
implications by using dm-crypt on a IO level. I know that a fair amount
is available that highlight the CPU overhead and some benchmarks seem
to be around but that's not really what I'm after. Obviously a delay on
processing on crypto/cpu side will at some stage hamper overall IO
capabilities. Does anyone have any reference to numbers that show
direct impact on an IOPS side when system-resources like CPU and memory
are not really at play?

Your help is much appreciated.

Kind regards,
Erwin

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