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


Arjan van de Ven wrote:
> 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...
>


The rules about how long a hard irq would be allowed to run would have
to be draconian.

... not that that would be a problem.


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