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    SubjectRe: [patch] 2.4.0, 2.4.0-ac12: APIC lock-ups
    "Maciej W. Rozycki" wrote:
    > I'll implement an 82489DX update in a few days, but for now I'd like
    > everyone interested to test the following patch as much as possible. It
    > applies to 2.4.0, 2.4.0-ac12 and 2.4.1-pre11 cleanly.
    I'm not totally convinced that this fixes all problems:

    No lockup, and but a slightly increased packet loss: every few minutes a
    block of 5-10 packets is lost. Cpu load is low (~30%), I'm running 3
    concurrent bw_tcp, the io apic computer is the 'server'.

    IIRC my original patch caused a far higher packet loss, perhaps because
    it's slower? (you wrote something about 2 r/w accesses).

    Are you sure that this really fixed the bug?
    Remember that switching the 'trigger mode' bit will revive the io apic.

    It's possible that
    * the io apic still locks up.
    * but now {en,dis}able_irq() switches the 'trigger mode' bit, and thus
    resets the io apic after a few msec --> a few lost packets.

    It's far better than before, but I assume the bug is hidden, not fixed.

    I'll make additional tests.

    Send the patch to Linus - it makes ne2k cards usable with 2.4+io apic.

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