Re: [PATCH v2 0/4] crypto: rockchip: Add RK356x/RK3588 cryptographic offloader

[Diederik de Haas]

On Tue Aug 18, 2026 at 10:04 PM CEST, Eric Biggers wrote:
> tcrypt.c reports cycle counts from get_cycles(), which has an
> architecture-dependent meaning.  On x86_64 it is something approximating
> the CPU cycles (3-5 GHz) whereas on arm64 it is the ARM Generic Timer
> which tends to be around 24 MHz or so, over 100 times slower than the
> actual CPU.  So 9044 vs 115 "cycles" for x86_64 vs arm64 sounds about
> expected, and they suggest the real times are likely similar but
> slightly faster on x86_64 as expected.

Phew, thanks for the explanation :-)

> This sort of thing is why benchmarks usually should measure real time.
> The legacy module tcrypt.c unfortunately uses get_cycles() instead.

What would be a better/non-legacy way to test crypto performance?
Is that documented somewhere?

Cheers,
  Diederik