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 -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
