when we see the “PCI-MSI-edge” in Mikrotik. Now we have only “IO-APIC-level” interrupts even if installed PCI-EX Intel Gigabit network card.When 3 or more network interface in router IO-APIC-level interrups slowing the system.
But in linux (Ubuntu server , kernel 2.6.24 or 2.6.27) on same router show “PCI-MSI-edge” interrupts.