A 6-CPU core 9.1-RELEASE-p4 system equipped with intel 82599EB NIC with hw.ixgbe.num_queues=6 hangs when traffic volume is heavy.
The system hang can be workarounded by setting hw.ixgbe.num-queues=4
change hw.ixgbe.num_queues=4 (or 2) in /boot/loader.conf
How-To-Repeat: HW/SW setup - 9.1-RELEASE-p4 with the 82599EB NIC on a 6-CPU core system
Using a nginx webserver and use clients like http_load to stress the 10G network interface. System will hang within 30 seconds.
Hard reboot is required.
Over to maintainer(s).
This is not happening for me when I turn num_queues to any value. I suspect it is fixed. Please reopen this issue if it is still occuring.