From
servers in a data center to desktop computers, many devices
communicating on a network will eventually have to filter network
traffic, whether it's for security or performance reasons. As a result,
this is a domain where a lot of work is put into improving performance:
a tiny performance improvement can have considerable gains.

Bpfilter is a
project that allows for packet filtering to easily be done with BPF, which can be faster than other mechanisms.

https://lwn.net/Articles/1017705/
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