On Tue, 2016-12-06 at 19:32 -0800, Eric Dumazet wrote:
> A follow up patch will provide a static_key (Jump Label) since most
> hosts do not even use RFS.
Speaking of static_key, it appears we now have GRO on UDP, and this
consumes a considerable amount of cpu cycles.
Turning off GRO allows me to get +20 % more packets on my single UDP
socket. (1.2 Mpps instead of 1.0 Mpps)
Surely udp_gro_receive() should be bypassed if no UDP socket has
registered a udp_sk(sk)->gro_receive handler
And/or delay the inet_add_offload(&udpv{4|6}_offload, IPPROTO_UDP); to
the first UDP sockets setting udp_sk(sk)->gro_receive handler,
ie udp_encap_enable() and udpv6_encap_enable()
:(
