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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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