以 Linux XDP (eXpress Data Path) 為基礎的高效率網路負載平衡器

COSCUP 2020

馮會鈞

Agenda

  • What is XDP
  • A load balancer based on XDP
  • XDP playground

What is XDP?

  • a subset of eBPF program
  • early network packet processing
  • attached to the network device driver

Execution mode

Action

  • XDP_DROP
  • XDP_ABORTED
  • XDP_PASS
  • XDP_TX
  • XDP_REDIRECT

Layer 4 load balancer

Benefits of XDP based LB

  • fewer resources spent on each packet
  • higher availability
  • higher capacity

How XDP load balancer works

Routing decision algorithm

XLB

Reference

Thank you!

Q&A

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