SO_ATTACH_REUSEPORT_CBPF option for socket

[sl1200mk2]

Hi,
In this document: https://www.slideshare.net/lfevents/boost-udp-transaction-performance
author is considering the use of SO_ATTACH_REUSEPORT_CBPF for sockets in order to speed UDP transaction.
Is it something we can benefit?

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[radarsat1]

Interesting, looks like it couldn't hurt.. http://man7.org/linux/man-pages/man7/socket.7.html

If the BPF program
returns an invalid index, socket selection will fall back to
the plain SO_REUSEPORT mechanism.

I don't fully understand if OSC would stand to gain much, from the slides it appears that it's for very heavy UDP traffic. I guess it could, depending on the user. But as long as it doesn't hurt anything and could make things better, I see little reason not to try it.

I suppose I might want to test with several liblo-using applications to make sure there aren't any adverse effects.

[sl1200mk2]

SO_REUSEPORT doesn't play nice on windows, so maybe it could be just for macos/linux.
I really don't know if we could gain something...
reading some docs I found this one which explains BPF (search for BPF Programs):
http://newosxbook.com/bonus/vol1ch16.html

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[sl1200mk2]

well it seems complicated... one should open BPF device for read-write access, put the filtering and attach it to an interface ('en0', 'lo0', etc...).
so it may not fit our needs...

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