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SubjectPCI IRQs and IO-APIC
Hi,

I am using a 2.4.20 Linux kernel with an Intel SDS2
motherboard. By default, USB doesn't function as is shown
by this /proc/interrupts

CPU0 CPU1
0: 146457 142403 IO-APIC-edge timer
1: 1 1 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
4: 616 690 IO-APIC-edge serial
7: 0 0 IO-APIC-edge parport0
14: 0 2 IO-APIC-edge ide0
16: 27394 27504 IO-APIC-level aic7xxx
17: 9 7 IO-APIC-level aic7xxx
18: 10562 10579 IO-APIC-level eth0
19: 6871 6786 IO-APIC-level eth1
22: 446759 445440 IO-APIC-level ide2, ide3
23: 8089 7770 IO-APIC-level mxser
24: 229 213 IO-APIC-level EMU10K1
25: 9 7 IO-APIC-level aic7xxx
28: 10 6 IO-APIC-level aic7xxx
33: 0 0 none usb-ohci
NMI: 0 0
LOC: 288724 288714
ERR: 0
MIS: 0

Booting with the noapic option does fix this and only gives
16 IRQs so many devices wind up sharing. The other thing I
tried was the ACPI patch at www.sf.net/projects/acpi and
that also fixed the problem with the APIC enabled.

CPU0 CPU1
0: 3142365 3090327 IO-APIC-edge timer
1: 1 1 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
4: 221 216 IO-APIC-edge serial
7: 21 10 IO-APIC-edge parport0
9: 2 4 IO-APIC-level acpi
10: 2 0 IO-APIC-edge usb-ohci
14: 2 0 IO-APIC-edge ide0
16: 152211 153488 IO-APIC-level aic7xxx
17: 9 7 IO-APIC-level aic7xxx
18: 271568 270316 IO-APIC-level eth0
19: 8492 8638 IO-APIC-level eth1
22: 26577 25716 IO-APIC-level ide2, ide3
23: 213562 200629 IO-APIC-level mxser
24: 12651 12583 IO-APIC-level EMU10K1
25: 11 5 IO-APIC-level aic7xxx
28: 9 7 IO-APIC-level aic7xxx
NMI: 0 0
LOC: 6231968 6231965
ERR: 0
MIS: 0

Regards,
Shane
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