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SubjectRe: Why do so many machines need "noapic"?
On 09/06/2007 07:31 AM, Andi Kleen wrote:
> Chuck Ebbert <cebbert@redhat.com> writes:
>
>> Some systems lock up without the noapic option.
>
> Please find patterns: cpu type, chipsets, mainboard vendors etc.
>

This is the first one I've actually had in front of me:

HP TX1000 notebook
Nvidia C51/MCP51 mobile chipset

Booting with "noapic" gives some very strange results. This is two
snapshots of /proc/interrupts taken one second apart. It almost looks
like timer interrupts are occurring on IRQ 0 and IRQ7 on different
CPUs:

CPU0 CPU1
0: 446096 6224 XT-PIC-XT timer
1: 342 6 XT-PIC-XT i8042
2: 0 0 XT-PIC-XT cascade
5: 3099 865 XT-PIC-XT sata_nv
7: 8145 494718 XT-PIC-XT ehci_hcd:usb2
8: 0 0 XT-PIC-XT rtc0
9: 323 9 XT-PIC-XT acpi
10: 136 36 XT-PIC-XT HDA Intel
11: 43884 1091 XT-PIC-XT ohci_hcd:usb1, eth0
12: 104 19 XT-PIC-XT i8042
14: 1011 25 XT-PIC-XT libata
15: 0 0 XT-PIC-XT libata
NMI: 0 0
LOC: 6212 445951
ERR: 403241
MIS: 0

CPU0 CPU1
0: 447098 6233 XT-PIC-XT timer
1: 343 6 XT-PIC-XT i8042
2: 0 0 XT-PIC-XT cascade
5: 3100 865 XT-PIC-XT sata_nv
7: 8158 495847 XT-PIC-XT ehci_hcd:usb2
8: 0 0 XT-PIC-XT rtc0
9: 323 9 XT-PIC-XT acpi
10: 136 36 XT-PIC-XT HDA Intel
11: 43988 1094 XT-PIC-XT ohci_hcd:usb1, eth0
12: 104 19 XT-PIC-XT i8042
14: 1032 26 XT-PIC-XT libata
15: 0 0 XT-PIC-XT libata
NMI: 0 0
LOC: 6221 446953
ERR: 404383
MIS: 0


>> I found one
>> that will freeze while trying to set up the timer interrupt.
>> Passing 'nolapic' makes it freeze just after:
>>
>> Setting up timer through ExtINT... works
>
> Always boot with apic=debug
>

I can't capture the messages. Even when it boots it doesn't last
long enough to get them.

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