I have a 4 processor Xeon system booted with:
kernel /vmlinuz-2.4.22-1.2166.nptlsmp ro root=/dev/md2 nmi_watchdog=1
/proc/interrupts looks pretty sick:
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 5851570 0 0 0 0 0 0 0 IO-APIC-edge timer 1: 297 0 0 0 0 0 0 0 IO-APIC-edge keyboard 2: 0 0 0 0 0 0 0 0 XT-PIC cascade 8: 1 0 0 0 0 0 0 0 IO-APIC-edge rtc 10: 0 0 0 0 0 0 0 0 IO-APIC-level usb-ohci 12: 27 0 0 0 0 0 0 0 IO-APIC-edge PS/2 Mouse 14: 44 0 0 0 0 0 0 1 IO-APIC-edge ide0 16: 30 0 0 0 0 0 0 0 IO-APIC-level aic7xxx 17: 17447214 0 0 0 0 0 0 0 IO-APIC-level eth0 21: 10844601 0 0 0 0 0 0 0 IO-APIC-level aic7xxx 26: 26224 0 0 0 0 0 0 0 IO-APIC-level aic7xxx 30: 71 0 0 0 0 0 0 0 IO-APIC-level aic7xxx 32: 30 0 0 0 0 0 0 0 IO-APIC-level aic7xxx 37: 30 0 0 0 0 0 0 0 IO-APIC-level aic7xxx 41: 30 0 0 0 0 0 0 0 IO-APIC-level aic7xxx NMI: 5851257 5851257 5851257 5851257 5851257 5851257 5851257 5851257 LOC: 5851829 5851828 5851827 5851827 5851827 5851828 5851827 5851807 ERR: 0 MIS: 0
I'll try restarting without the nmi_watchdog soon.