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# 以 Linux XDP (eXpress Data Path) 為基礎的高效率網路負載平衡器
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## COSCUP 2020
### 馮會鈞
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### Agenda
- What is XDP
- A load balancer based on XDP
- XDP playground
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### What is XDP?
- a subset of eBPF program
- early network packet processing
- attached to the network device driver
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## Execution mode
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## Action
- XDP_DROP
- XDP_ABORTED
- XDP_PASS
- XDP_TX
- XDP_REDIRECT
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## Layer 4 load balancer
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## Benefits of XDP based LB
- fewer resources spent on each packet
- higher availability
- higher capacity
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## How XDP load balancer works
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## Routing decision algorithm
- Modulo division
- [Consistent hashing](https://en.wikipedia.org/wiki/Consistent_hashing)
- [Maglev](https://research.google/pubs/pub44824/) (used by Facebook katran)
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## [XLB](https://github.com/foxhoundsk/xlb)
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## Reference
- [XDP tutorial](https://github.com/xdp-project/xdp-tutorial/)
- [Facebook katran](https://github.com/facebookincubator/katran)
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## Thank you!
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## Q&A
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