EHCI interrupt storm (~24000 per second) on 12.0 (Lynx Point chipset)
I have an Intel Server board (it's a UEFI Development Kit system, based
on the S1200V3RPS) that I recently upgraded to 12.0-RELEASE, and today
noticed the intr task taking up too much CPU time. I can't say whether
this is a regression from 11.x or not.
Looking at the output of "vmstat -i" there appears to be an interrupt storm: