Re: [PATCH 7/7] s390/vdso: Wire up getrandom() vdso implementation

Jason A. Donenfeld
2024-09-13T14:57:28Z

On Fri, Sep 13, 2024 at 04:16:51PM +0200, Heiko Carstens wrote:
> On Fri, Sep 13, 2024 at 03:53:43PM +0200, Jason A. Donenfeld wrote:
> > On Fri, Sep 13, 2024 at 03:05:43PM +0200, Heiko Carstens wrote:
> > > The vdso testcases vdso_test_getrandom and vdso_test_chacha pass.
> >
> > I'd be curious to see the results of ./vdso_test_getrandom bench-single
> > and such.
>
> It looks like this with two layers of hypervisors in between, but that
> shouldn't matter too much for this type of workload:
>
> $ ./vdso_test_getrandom bench-single
> vdso: 25000000 times in 0.493703559 seconds
> libc: 25000000 times in 6.371764073 seconds
> syscall: 25000000 times in 6.584025337 seconds

Cool. I'll amend that to the commit message, perhaps, so we have some
historical snapshot of what it does. What cpu generation/model is this?

Jason