I've got the following in top under lucid latest:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4 root 20 0 0 0 0 R 98 0.0 1803:21 ksoftirqd/0
watching /proc/interrupts isn't very informative. here's what it shows:
# cat /proc/interrupts
CPU0 CPU1
0: 1846 624 IO-APIC-edge timer
1: 103937 21184 IO-APIC-edge i8042
6: 1009980 1094791 IO-APIC-edge
8: 1 0 IO-APIC-edge rtc0
9: 243889 51 IO-APIC-fasteoi acpi
12: 10631504 73 IO-APIC-edge i8042
16: 16935518 15340624 IO-APIC-fasteoi uhci_hcd:usb3, nvidia
18: 30 0 IO-APIC-fasteoi uhci_hcd:usb8, jmb38x_ms:slot0,
ohci1394, mmc0
19: 6179955 3153 IO-APIC-fasteoi ata_piix, ata_piix,
ehci_hcd:usb1, uhci_hcd:usb5, uhci_hcd:usb7
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
22: 336170 149 IO-APIC-fasteoi HDA Intel
23: 1 7571 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6
30: 1505 4805 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 212005467 154165209 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 0 0 Performance monitoring interrupts
PND: 0 0 Performance pending work
RES: 86606397 101594398 Rescheduling interrupts
CAL: 14578 7770 Function call interrupts
TLB: 1927732 1460655 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 1158 1151 Machine check polls
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ksoftirqd/1 using 50% CPU or above
https://bugs.launchpad.net/bugs/183461
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