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If anyone could summarize what makes DragonFly's stack different I'd be obliged.

I understand FreeBSD's networking stack has been well-regarded since the 90s[1] and has shipped in many environments and consumer devices. Now that it's 2017, it's interesting to see what else is out there.

[1] https://people.freebsd.org/~andre/tcpoptimization.html

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Literally the entire section 2 of the linked to file discusses exactly what you're interested to know. It details the evolution of the DragonFlyBSD's network stack, which started as the FreeBSD network stack.

Yeah I believe Matt forked FreeBSD 4.x to start dragonfly.

I saw that, cheers.

I'm more interested in the higher level takeaway. Why should developers use Dragonfly?

Don't get me wrong, I appreciate the ability to peruse the kernel implementation narrative in the first place. As I'm not a kernel developer I'm left wondering what it means.

e.g. better multicore performance?

I would look here:

https://www.dragonflybsd.org/features/

and here:

https://www.dragonflybsd.org/performance/

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