RE: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t

[Reshetova, Elena]

> From: Kees Cook <keescook@xxxxxxxxxxxx>
> Date: Thu, 16 Mar 2017 11:38:25 -0600
> 
> > I am, of course, biased, but I think the evidence of actual
> > refcounting attacks outweighs the theoretical performance cost of
> > these changes.
> 
> This is not theoretical at all.
> 
> We count the nanoseconds that every packet takes to get processed and
> you are adding quite a bit.
> 
> I understand your point of view, but this is knowingly going to add
> performance regressions to the networking code.

Should we then first measure the actual numbers to understand what we are talking here about? 
I would be glad to do it if you suggest what is the correct way to do measurements here to actually reflect the real life use cases. 

Best Regards,
Elena.