On Tue, Mar 17, 2015 at 06:05:13PM +0000, Ard Biesheuvel wrote: > This changes the AES core transform implementations to issue aese/aesmc > (and aesd/aesimc) in pairs. This enables a micro-architectural optimization > in recent Cortex-A5x cores that improves performance by 50-90%. > > Measured performance in cycles per byte (Cortex-A57): > > CBC enc CBC dec CTR > before 3.64 1.34 1.32 > after 1.95 0.85 0.93 > > Note that this results in a ~5% performance decrease for older cores. > > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > --- > > Will, > > This is the optimization you yourself mentioned to me about a year ago > (or even longer perhaps?) Anyway, we have now been able to confirm it > on a sample 'in the wild', (i.e., a Galaxy S6 phone) I barely remember one day to the next, but hey! I'll queue this for 4.1. Will -- 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
