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    SubjectRe: IRQ handling difference between i386 and x86_64
    On Sat, 2007-06-30 at 16:55 +0200, Krzysztof Oledzki wrote:
    > Hello,
    > It seems that IRQ handling is somehow different between i386 and x86_64.
    > In my Dell PowerEdge 1950 is it possible to enable interrupts spreading
    > over all CPUs. This a single CPU, four CORE system (Quad-Core E5335 Xeon)
    > so I think that interrupts migration may be useful. Unfortunately, it
    > works only with 32-bit kernel. Booting it with x86_64 leads to situation,
    > when all interrupts goes only to the first cpu matching a smp_affinity
    > mask.

    arguably that is the most efficient behavior... round robin of
    interrupts is the worst possible case in terms of performance

    are you using irqbalance ? (

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