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SubjectSMP and CPU1 not showing interrupts in /proc/interrupts
somewhere between about 2.5.53 and 2.5.62 my /proc/interrupts has gone 
from an approximately even distribution of interrupts between CPU0 and
CPU1 to grossly uneven:

CPU0 CPU1
0: 13223321 2233217 IO-APIC-edge timer
1: 13442 0 IO-APIC-edge i8042
2: 0 0 XT-PIC cascade
3: 291874 0 IO-APIC-edge serial
8: 3 0 IO-APIC-edge rtc
9: 0 0 IO-APIC-edge acpi
14: 18932 0 IO-APIC-edge ide0
15: 14 0 IO-APIC-edge ide1
16: 190607 1 IO-APIC-level eth0, nvidia
17: 3214 0 IO-APIC-level bttv0
18: 14249 1 IO-APIC-level ide2
19: 121942 0 IO-APIC-level uhci-hcd, wlan0
NMI: 0 0
LOC: 15458218 15458423
ERR: 0
MIS: 0

if i really hit the system hard then CPU1 will start accruing interrupts
but in a mostly idle state CPU1 just sits on its bum and lets CPU0
handle them all, with the exception of irq #0, for some reason.

any ideas?

thanks

James


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