On 04/24/2018 04:47 AM, Yafang Shao wrote:
> > Could you pls. explain the issue to me ? Just run a synflood test on your host, it will definitely show the atomic consuming most cpu cycles in inet_reqsk_alloc(), because of huge contention on a cache line shared by all cpus. Performance is reduced from ~5 Mpps to ~3.8 Mpps with 16 RX queues on my host. atomic64_inc_return(&sock_net(sk)->cookie_gen) was not meant to be used in the normal case (when a socket cookie is not ever requested/needed)
