Hi,
I've been trying the Sahara crypto module on i.MX53 [mainline 3.19
kernel + b251638c46a (crypto: sahara - use the backlog)]
I tested using dm-crypt with AES-128:
cryptsetup -v --key-size=128 luksFormat /dev/mmcblk0p7
cryptsetup luksOpen /dev/mmcblk0p7 cryptotest
dd if=/dev/mapper/cryptotest of=/dev/null bs=1M count=100
CPU Freq (MHz) Time (s) WITHOUT Sahara Time (s) WITH Sahara
1200 3.26 5.34
1000 3.26 5.62
800 4.0 6.24
400 7.72 9.86
166 18.42 18.87
I was hoping for something better.
There is a reduction in CPU usage as expected but the performance
figures aren't looking very good.
As this is in kernel use by dm-crypt cryptodev or af_alg aren't involved.
Has anyone else done any measurements?
Something wrong with my setup or with my expectations?
Regards,
Martin
Hi!
On Mon, Apr 27, 2015 at 07:16:22PM +0200, Martin Fuzzey wrote:
> Hi,
>
> I've been trying the Sahara crypto module on i.MX53 [mainline 3.19
> kernel + b251638c46a (crypto: sahara - use the backlog)]
>
> I tested using dm-crypt with AES-128:
> cryptsetup -v --key-size=128 luksFormat /dev/mmcblk0p7
> cryptsetup luksOpen /dev/mmcblk0p7 cryptotest
>
> dd if=/dev/mapper/cryptotest of=/dev/null bs=1M count=100
>
>
> CPU Freq (MHz) Time (s) WITHOUT Sahara Time (s) WITH Sahara
> 1200 3.26 5.34
> 1000 3.26 5.62
> 800 4.0 6.24
> 400 7.72 9.86
> 166 18.42 18.87
>
> I was hoping for something better.
> There is a reduction in CPU usage as expected but the performance
> figures aren't looking very good.
> As this is in kernel use by dm-crypt cryptodev or af_alg aren't involved.
>
> Has anyone else done any measurements?
>
Yes. My measurements wheren't overwhelming either. :-(
The problem with the Sahara is: NDAs. So, I am Jon Snow
and know nothing :-(
Everything I do know, is from the Freescale kernel git repo.
Maybe I missed something. The FSL driver is very cryptic if
you ask me; so it is absolutely possible.
Regards,
Steffen
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