Created attachment 218861 [details]
I upgraded a server using the em driver from 11-STABLE to 12-STABLE 2 days ago.
I had previously tried EM_MULTIQUEUE but it behaved badly so was operating on single queue.
Since the update I am getting latency spikes, confirmed even on LAN. I have smokeping graphs which show this if required, it was initially noticed by myself with lag in the ssh session which seems to come on for a couple of seconds and then disappears, but affects all traffic.
I observed that in 12-STABLE multiqueue now seems to be enforced, on other drivers such as igb there is a boot time tunable.
Is there a way to toggle multiqueue, or something else I can try to fix it, otherwise I am posting here a problem report.
I did also find this PR but has been closed.
Additional notes, it was yesterday I did the upgrade sorry, the graph improves during the dusk hours after I disabled LRO on the nic, but it didnt revert the previous behaviour just a improvement.