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    SubjectRe: APIC-Errors+Crashes on GA 586DX, 2.2.17/2.4.3
    > here. These errors itself are not a problem since the APIC bus detect
    > it and recover, but if here are double errors in a way that the checksum
    > is OK, the APIC may run in trouble.

    Also nothing but recent -ac kernels in the 2.4 range handle the replay of
    IPI's sometimes caused by this. That patch is a post 2.4.4 thing to sort out.

    > I don't know all kinds of events the APIC bus is used for, it is not only
    > for the IRQs.

    Interrupts from I/O devices and interrupts sent between processors. The latter
    are used to tell the other cpus to do things like flush TLB entries, change
    an MTRR value etc


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