SMP and CPU1 not showing interrupts in /proc/interrupts

From: James Harper (james.harper@bigpond.com)
Date: Sun Feb 23 2003 - 04:42:49 EST


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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