Messages in this thread | | | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable | From | Robert Love <> | Date | 12 Jan 2002 14:26:27 -0500 |
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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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