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SubjectRe: [PATCH v8 6/7] selftests: Add benchmark for syscall user dispatch
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@collabora.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

--
Kees Cook

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