Comment by tuetuopay

> It's therefore convenient for things like guest agents where you want them to "just work" without reconfiguration hassle.

This. The point of vsock is not performance, it's the zero-configuration aspect of them. No IP address plan. No firewall. No DHCP. No nothing. Just a network-like API for guest-host communication for guest agents and configuration agents. Especially useful to fetch a configuration without having a configuration.

IMHO the "fast" in the original article should be read as "quick to setup", not as "high bandwidth".