irqcheck tells about the IRQ and softirq cpus affinity
Example output
IRQ:
IRQ 0 [ ]: can run on [0 1 2 3]
IRQ 1 [ i8042]: can run on [0 1 2 3]
IRQ 2 [ ]: can run on [0 1 2 3]
IRQ 3 [ ]: can run on [0 1 2 3]
IRQ 4 [ ]: can run on [0 1 2 3]
IRQ 5 [ ]: can run on [0 1 2 3]
IRQ 6 [ ]: can run on [0 1 2 3]
IRQ 7 [ ]: can run on [0 1 2 3]
IRQ 8 [ rtc0]: can run on [0 1 2 3]
IRQ 9 [ acpi]: can run on [0 1 2 3]
IRQ 10 [ ]: can run on [0 1 2 3]
IRQ 11 [ ]: can run on [0 1 2 3]
IRQ 12 [ i8042]: can run on [0 1 2 3]
IRQ 13 [ ]: can run on [0 1 2 3]
IRQ 14 [ ]: can run on [0 1 2 3]
IRQ 15 [ ]: can run on [0 1 2 3]
IRQ 16 [ i801_smbus]: can run on [0 1 2 3]
IRQ 19 [ ]: can run on [0 1 2 3]
IRQ 120 [ ]: can run on [0]
IRQ 121 [ ]: can run on [0]
IRQ 125 [ xhci_hcd]: can run on [0 1 2 3]
IRQ 126 [ enp0s31f6]: can run on [0 1 2 3]
IRQ 127 [ nvme0q0]: can run on [0 1 2 3]
IRQ 128 [ nvme0q1]: can run on [0]
IRQ 129 [ nvme0q2]: can run on [1]
IRQ 130 [ nvme0q3]: can run on [2]
IRQ 131 [ nvme0q4]: can run on [3]
IRQ 132 [ i915]: can run on [0 1 2 3]
IRQ 133 [ mei_me]: can run on [0 1 2 3]
IRQ 134 [ snd_hda_intel:card0]: can run on [0 1 2 3]
IRQ 135 [ iwlwifi]: can run on [0 1 2 3]
IRQ 136 [ rmi4_smbus]: can run on [0 1 2 3]
IRQ 137 [ rmi4-00.fn34]: can run on [0 1 2 3]
IRQ 138 [ rmi4-00.fn01]: can run on [0 1 2 3]
IRQ 139 [ rmi4-00.fn03]: can run on [0 1 2 3]
IRQ 140 [ rmi4-00.fn11]: can run on [0 1 2 3]
IRQ 141 [ rmi4-00.fn11]: can run on [0 1 2 3]
IRQ 142 [ rmi4-00.fn30]: can run on [0 1 2 3]