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    SubjectRe: [PATCH 0/8] git pull request for tip/tracing/core
    Luck, Tony wrote:
    >>> Before we go and make the change, Peter brought up a good point on IRC. Is
    >>> there any reason that ia64 needs 1 << 14 IRQs? That's 16384!
    >>>
    >>> Perhaps the better solution wolud be (if possible), to simply lower the
    >>> number of bits.
    >> i'm the wrong person to be asked about that. (Cc:-ed the right people)
    >
    > People build some pretty big systems on ia64. SGI's largest has 4096
    > cpus ... so 16384 IRQs is only 4 per cpu. That doesn't sound like very
    > many to me.
    >
    > Fujitsu added the vector domain support for ia64 to get around the shortage
    > of IRQs for large machines. Added them to the Cc: list to see if they have
    > comments on how many IRQs are needed.
    >

    The 1024 IRQs are enough for GSIs on our maximum configuration. But
    if the devices are MSI/MSI-X capable, it could be more than 1024.

    Thanks,
    Kenji Kaneshige




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