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    SubjectRe: [2.6.12] x86-64 IO-APIC + timer doesn't work
    On Sat, Jun 18, 2005 at 02:52:52PM +0100, Alistair John Strachan wrote:
    > Hi,
    >
    > I upgraded my nForce3 x86-64 desktop from 2.6.12-rc5 to 2.6.12 today and
    > something strange started happening. Waay back in 2.6.x I had problems with
    > the "noapic" default for nForce boards on x86-64, and so used the "apic"
    > kernel boot parameter to force the apic on; this worked successfully for a
    > long time with no timer problems.

    apic hasn't been needed for several kernel releases now, since the
    timer override problem on the Nforce has been workarounded.

    >
    > However, as of 2.6.12 (maybe -rc6, too?) my desktop occasionally fails to boot
    > with the message:
    >
    > "IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter."
    > (arch/x86_64/kernel/io_apic.c)
    >
    > However, this message is intermittent; it is sometimes possible to boot
    > without getting it, and everything works fine. So I took its advice and ran
    > with noapic, and everything seems fine now.
    >
    > However, I just thought I'd let whoever maintains this bit of code know that
    > the check isn't a "sure thing": it's not being flagged reliably. Whether this
    > is my BIOS or the kernel, I don't know.
    >
    > Though I clearly don't require this functionality any more, is there any
    > reason I now can't use apic on this nForce3 board, where previously (on
    > 2.6.12-rc5 and older) I could?

    Are you sure the problem is new?

    Can you post the full output of a failing case with apic=verbose?

    -Andi
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