virtio NIC on OpenBSD 5.5-current

My Ansible host is OpenBSD. Because if I’m going to have a host that can manage my network, it needs to be ridiculously secure. The OpenBSD host runs on KVM (through the SolusVM virtualization management system).

During heavy data transfers, the network card would occasionally stop passing traffic. I could run any Ansible command without issue, but downloading an ISO caused hangs. This was most obvious during upgrades. Downloads would stall. I could restart them with ^Z, then a “ifconfig vio0...