On Tue, 2017-06-06 at 16:23 +0200, Paolo Abeni wrote: > Since UDP no more uses sk->destructor, we can clear completely > the skb head state before enqueuing. Amend and use > skb_release_head_state() for that. > > All head states share a single cacheline, which is not > normally used/accesses on dequeue. We can avoid entirely accessing > such cacheline implementing and using in the UDP code a specialized > skb free helper which ignores the skb head state. > > This saves a cacheline miss at skb deallocation time.
Acked-by: Eric Dumazet <eduma...@google.com>
