When I ran IOZONE benchmark on device with and without encryption, performance is upto 70% slower. This data is based on SW based crypto engine.
Thats why I was thinking if I can contribute to dm-crypt where it can accept larger packet sizes, it would be great for hardware based crypto engine solution.
HW based crypto engine outperforms the SW based when packet size reaches 8K.
On Mon, Jan 21, 2013 at 9:42 PM, Arno Wagner <arno@xxxxxxxxxxx> wrote:
Why would you want to do this? There doe snot seem to be any
good reason...
Arno
> _______________________________________________
On Mon, Jan 21, 2013 at 08:18:50PM -0800, Dinesh Garg wrote:
> Hi,
>
> Currently dm-crypt encrypts the block device using sector size. Is it
> possible to change this to use larger sizes such as 8K or 16K or larger? If
> not possible currently, what would it take to make that possible i..e what
> are the problems that we need to fix?
>
> Is it DM layer that restricts us to use larger sizes or file system due to
> its block size?
>
> I have one more question: How does a read operation ends up at calling
> dm-crypt api?
>
> Thanks,
> DG
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> dm-crypt@xxxxxxxx
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Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx
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with doubt and indecision. -- Bertrand Russell
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