Created attachment 218861 [details] smokeping data Hi 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. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234570 Chris
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.
(In reply to Chris Collins from comment #1) Hi Chris, I am interested in this report. Can you try 12.2 or 13.0? Can you provide some more info like an ifconfig, pciconf -lv and netstat -m?
Any chance of the above?