There is a fair bit of context behind this work. Some pointers:

1) Introduction. Receiving / sending packets with high throughput is hard:

* https://blog.cloudflare.com/how-to-receive-a-million-packets...

2) Achieving low latency is also hard, quick intro to kernel bypass proprietary solution OpenOnload:

* https://blog.cloudflare.com/how-to-achieve-low-latency/

3) Oh, you want to do kernel bypass in open source? All of off-the-shelve open source solutions take over the whole network card.

* https://blog.cloudflare.com/kernel-bypass/

4) Proposal for solving the problem in open source: the partial kernel bypass patch proposal to netmap:

* https://blog.cloudflare.com/single-rx-queue-kernel-bypass-wi...

5) It's there! The (updated) patch had been merged!

* https://blog.cloudflare.com/partial-kernel-bypass-merged-net...