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    SubjectRe: [2.4.17/18pre] VM and swap - it's really unusable
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    On Sat, 2002-01-12 at 13:54, Alan Cox wrote:
    > Another example is in the network drivers. The 8390 core for one example
    > carefully disables an IRQ on the card so that it can avoid spinlocking on
    > uniprocessor boxes.
    >
    > So with pre-empt this happens
    >
    > driver magic
    > disable_irq(dev->irq)
    > PRE-EMPT:
    > [large periods of time running other code]
    > PRE-EMPT:
    > We get back and we've missed 300 packets, the serial port sharing
    > the IRQ has dropped our internet connection completely.

    We don't preempt while IRQ are disabled.

    Robert Love

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