ARM public key benchmark

[Richard Henderson]

On 2013-04-04 06:51, Niels Möller wrote:
> And it's no use to even think of porting the loop mixer to arm without
> access to cycle-accurate timing.

Looking around the web it seems that what most folks do is write a
minimal kernel module that toggles the bit that allows userspace
access to the cycle counter MSRs.  They're generally supervisor only
because then userspace *could* set up cycle counter timer interrupts.

I havn't fiddled with this myself, because the A15 includes a real
high-resolution clock, which is accessed via CLOCK_MONOTONIC.

But it might be worth adding some code that looks for the MSR.  Just
set up a SIGILL handler and try the read.


r~