Poor performance on 100 Gbps adapter

[mcbarlo]

I need to configure BGP router for very high throughput. My hardware is:

Lenovo x3550 M5
1x E5-2697v3 CPU
Mellanox ConnectX-4 ethernet adapter 2x100GE

BGP daemon is Bird, kernel 4.9.95-gentoo.

Everything works fine to 30 Gbps bandwitch. Above this value CPU load caused by sys rise dramatically.

What I do to optimize:

1. Irqbalance daemon is disabled. SoftIRQ balancing fine.
2. Enabled jumbo frames.
3. Set net.core.netdev_budget to 600. May be shoud be higher?
4. Turn off adaptive-rx. Adaptive-tx was turned off default.

What can I do more? What kernel options I should watch for? Set tick to 100HZ or 1000HZ, use real time kernel sources?

I will be glad for any suggestion.

[massimo]

Eventually you find some clues at https://fasterdata.es.net/assets/Papers-and-Publications/100G-Tuning-TechEx2016.tierney.pdf and/or https://community.mellanox.com/docs/DOC-1523 .
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