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
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