Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option

[Arjan van de Ven]

On Fri, Sep 10, 2004 at 05:28:52PM +0200, Andrea Arcangeli wrote:
> On Fri, Sep 10, 2004 at 05:15:38PM +0200, Arjan van de Ven wrote:
> > because it gives people a reason to do sloppy coding.
> 
> it's not about bad drivers, it's about the number of nested interrupts
> not being limited by software right now.
> 
> > What we should consider regardless is disable the nesting of irqs for
> > performance reasons but that's an independent matter
> 
> disabling nesting completely sounds a bit too aggressive, but limiting
> the nesting is probably a good idea.

disabling is actually not a bad idea; hard irq handlers run for a very short
time, but when they nest you effectively have like a semi context switch in
the middle of the work so performance suffers...

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