Will PCI Express Still Use IRQs?

Discussion in 'IBM' started by Will, Sep 7, 2005.

  1. Will

    Will Guest

    After recently running into a situation where I ran out of IRQs on a system,
    I'm reminded that the whole IRQ system is a leftover from a much different
    day on the PC, and it's probably been outgrown at this point. Will PCI
    Express either do away with IRQs entirely or somehow introduce additional
    interrupts so that cards that require hardware interrupts don't have to
    steal from the limited pool of IRQs available in the original PC
    architecture?

    --
    Will
     
    Will, Sep 7, 2005
    #1
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  2. Will

    daytripper Guest

    On Tue, 6 Sep 2005 18:09:06 -0700, "Will" <>
    wrote:

    >After recently running into a situation where I ran out of IRQs on a system,
    >I'm reminded that the whole IRQ system is a leftover from a much different
    >day on the PC, and it's probably been outgrown at this point. Will PCI
    >Express either do away with IRQs entirely or somehow introduce additional
    >interrupts so that cards that require hardware interrupts don't have to
    >steal from the limited pool of IRQs available in the original PC
    >architecture?


    PCI Express uses in-band message-based interrupts, not the side-banded
    level-sensitive interrupts of PCI & PCI-X Mode 1. Oodles of MSIs, no sharing
    required...
     
    daytripper, Sep 7, 2005
    #2
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  3. Will

    The Outsider Guest

    On Tue, 6 Sep 2005 18:09:06 -0700, "Will"
    <> wrote:

    >After recently running into a situation where I ran out of IRQs on a system,
    >I'm reminded that the whole IRQ system is a leftover from a much different
    >day on the PC, and it's probably been outgrown at this point. Will PCI
    >Express either do away with IRQs entirely or somehow introduce additional
    >interrupts so that cards that require hardware interrupts don't have to
    >steal from the limited pool of IRQs available in the original PC
    >architecture?


    On XP IRQ's are already done away with, it uses memory address space
    instead.Sure it shows an IRQ for devices but if two devices are
    sharing the same IRQ it doesn't matter.
     
    The Outsider, Oct 13, 2005
    #3
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