Re: [PATCH v8 6/7] selftests: Add benchmark for syscall user dispatch

[Kees Cook]

On Fri, Nov 27, 2020 at 02:32:37PM -0500, Gabriel Krisman Bertazi wrote:
> This is the patch I'm using to evaluate the impact syscall user dispatch
> has on native syscall (syscalls not redirected to userspace) when
> enabled for the process and submiting syscalls though the unblocked
> dispatch selector. It works by running a step to define a baseline of
> the cost of executing sysinfo, then enabling SUD, and rerunning that
> step.
> 
> On my test machine, an AMD Ryzen 5 1500X, I have the following results
> with the latest version of syscall user dispatch patches.
> 
> root@olga:~# syscall_user_dispatch/sud_benchmark
>   Calibrating test set to last ~5 seconds...
>   test iterations = 37500000
>   Avg syscall time 134ns.
>   Caught sys_ff00
>   trapped_call_count 1, native_call_count 0.
>   Avg syscall time 147ns.
>   Interception overhead: 9.7% (+13ns).
> 
> Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook