log of interrupt arrange (nolapic) :

BOOT_IMAGE=/boot/vmlinuz-2.6.31-16-generic root=UUID=27632531-dd03-4a63-91c3-8b6f1fdf9a82 ro quiet splash nolapic
CPU0
0: 10855 XT-PIC-XT timer
1: 4 XT-PIC-XT i8042
2: 0 XT-PIC-XT cascade
5: 3535 XT-PIC-XT ahci
7: 1 XT-PIC-XT
8: 1 XT-PIC-XT rtc0
9: 537 XT-PIC-XT acpi, ohci_hcd:usb2, ath
10: 633 XT-PIC-XT HDA Intel
11: 54 XT-PIC-XT eth0
12: 6 XT-PIC-XT i8042
15: 835 XT-PIC-XT ehci_hcd:usb1
NMI: 0 Non-maskable interrupts
LOC: 0 Local timer interrupts
SPU: 0 Spurious interrupts
CNT: 0 Performance counter interrupts
PND: 0 Performance pending work
RES: 0 Rescheduling interrupts
CAL: 0 Function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
MCE: 0 Machine check exceptions
MCP: 1 Machine check polls
ERR: 1
MIS: 0

* CPUINFO still show two CPU inside, and working