On Mon, 2017-01-09 at 09:43 -0800, Cong Wang wrote: > On Mon, Jan 9, 2017 at 7:03 AM, Jesper Dangaard Brouer > <bro...@redhat.com> wrote: > > > > Use-case: The specific case I experienced this being a bottleneck is, > > sending UDP packets to a port with no listener, which obviously result > > in kernel replying with ICMP Destination Unreachable (type:3), Port > > Unreachable (code:3), which cause the bottleneck. > > Why this is a case we should care about for performance?
This is called provisioning. If you have a server farm that was qualified to handle 100 Mpps, you want to absorb these 100 Mpps, even if the UDP server is restarted in a clean or catastrophic mode. The catastrophic mode would be the case that Jesper described : No UDP socket is bound and ready to receive packets.
