I have same problem without PCMCIA on Inter Server board. CPU load is
about 40% on Quad Xeon.
cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 61 0 0 1 IO-APIC-edge timer
1: 3 3 1 1 IO-APIC-edge i8042
4: 28654 26191 30733 28929 IO-APIC-edge serial
6: 1 0 1 1 IO-APIC-edge floppy
8: 0 0 0 0 IO-APIC-edge rtc
9: 896941325 896922559 896757914 897041450 IO-APIC-fasteoi acpi
12: 0 0 2 2 IO-APIC-edge i8042
14: 2757332 2785060 2831206 2752744 IO-APIC-edge libata
15: 2764758 2792896 2847483 2753909 IO-APIC-edge libata
17: 0 0 0 0 IO-APIC-fasteoi
uhci_hcd:usb3, ehci_hcd:usb7
18: 0 0 0 0 IO-APIC-fasteoi
uhci_hcd:usb1, uhci_hcd:usb6
19: 0 0 0 0 IO-APIC-fasteoi
uhci_hcd:usb5
21: 26 21 34 36 IO-APIC-fasteoi
uhci_hcd:usb2, libata
23: 0 0 0 0 IO-APIC-fasteoi
uhci_hcd:usb4, ehci_hcd:usb8
2301: 4111264 4076633 4135991 4026291 PCI-MSI-edge eth0
NMI: 0 0 0 0 Non-maskable interrupts
LOC: 13185750 16779643 12476739 12062227 Local timer interrupts
RES: 83453 77866 120464 106199 Rescheduling interrupts
CAL: 967 416 919 947 function call interrupts
TLB: 1937586 2664499 2115439 2427403 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
SPU: 0 0 0 0 Spurious interrupts
ERR: 0
** Attachment added: "dmesg output"
http://launchpadlibrarian.net/19779202/dmesg-samba.txt
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kacpid eat all CPU when PCMCIA card is inserted
https://bugs.launchpad.net/bugs/285209
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