For years I have used the graphical PM program IRQMon to monitor IRQ usage but now I am considering moving to using ACPI rather than OS2APIC.PSD because of problems I am having with a new motherboard that stacks things like nic, usb, hard disk controllers all on the same IRQ 11 (fine if I am not doing much but a PITA when I want to copy something from a USB disk to the NAS box and do something else that brings the internal hard disk into use).
Now the question is, is there an equivalent to IRQMon that can be left running all the time and display IRQ usage on a real time basis and show the high IRQ numbers? Is it even possible to do so with IRQs above 15?