On Tue, Jul 24, 2007 at 02:49:47PM -0400, Chris Snook wrote:
> Is it always CPU 0, or does it move? Are you running irqbalance? If
> you're running irqbalance, you can run a script that alternates between
> 'cat /proc/interrupts' and 'mpstat -P ALL 5 10' and watch the offending
> interrupt jump around between processors. It's not as informative as
> oprofile, as Andi suggested, but it's really easy to set up.
Always cpu0
# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 166 0 0 0 XT-PIC-XT timer
1: 8 0 0 0 XT-PIC-XT i8042
2: 0 0 0 0 XT-PIC-XT cascade
3: 11 0 0 0 XT-PIC-XT serial
4: 830 0 0 0 XT-PIC-XT serial
5: 370787109 0 0 0 XT-PIC-XT eth0
6: 3 0 0 0 XT-PIC-XT floppy
8: 4 0 0 0 XT-PIC-XT rtc
9: 0 0 0 0 XT-PIC-XT
ohci_hcd:usb1, ohci_hcd:usb2
10: 80937699 0 0 0 XT-PIC-XT 3w-9xxx,
3w-9xxx
12: 5 0 0 0 XT-PIC-XT i8042
14: 50931 0 0 0 XT-PIC-XT ide0
NMI: 1110304 275156 276732 233082
LOC: 278410000 278410022 278410013 278410014
ERR: 55003177
MIS: 0
# mpstat -P ALL 5 1
Linux 2.6.21.5 (*.com) 07/24/07
11:52:30 CPU %user %nice %system %iowait %irq %soft %idle
intr/s
11:52:35 all 0.40 0.00 16.12 13.56 0.25 25.13 44.54
299.80
11:52:35 0 0.00 0.00 0.00 0.00 1.00 99.00 0.00
299.80
11:52:35 1 0.80 0.00 23.65 23.05 0.00 0.40 52.10
0.00
11:52:35 2 0.40 0.00 21.64 14.23 0.00 0.40 63.53
0.00
11:52:35 3 0.60 0.00 19.44 17.03 0.00 0.60 62.73
0.00
Average: CPU %user %nice %system %iowait %irq %soft %idle
intr/s
Average: all 0.40 0.00 16.12 13.56 0.25 25.13 44.54
299.80
Average: 0 0.00 0.00 0.00 0.00 1.00 99.00 0.00
299.80
Average: 1 0.80 0.00 23.65 23.05 0.00 0.40 52.10
0.00
Average: 2 0.40 0.00 21.64 14.23 0.00 0.40 63.53
0.00
Average: 3 0.60 0.00 19.44 17.03 0.00 0.60 62.73
0.00
#
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