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SubjectRe: [2.4.17/18pre] VM and swap - it's really unusable
Alan Cox wrote:

> > > 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.
>
> I must have missed that in the code. I can see you check __cli() status but
> I didn't see anywhere you check disable_irq(). Even if you did it doesnt
> help when I mask the irq on the chip rather than using disable_irq() calls.
>
> Alan

But you get interrupted by other interrups then so you have the same problem
reagardless of any preemtion patch you hopefully lose the cpu for a much
shorter time but still the same problem.


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