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Date: Thu, 16 Mar 2017 12:10:32 -0700 (PDT) From: David Miller <davem@...emloft.net> To: keescook@...omium.org Cc: eric.dumazet@...il.com, peterz@...radead.org, elena.reshetova@...el.com, netdev@...r.kernel.org, bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru, jmorris@...ei.org, kaber@...sh.net, stephen@...workplumber.org, ishkamiel@...il.com, dwindsor@...il.com Subject: Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t From: Kees Cook <keescook@...omium.org> 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.
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