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

[Andrea Arcangeli]

On Wed, Oct 20, 2004 at 12:39:06PM -0400, Lee Revell wrote:
> The IDE I/O completion in hardirq context means that one can run for
> almost 3ms.  Apparently at OLS it was decided that the target for
> desktop responsiveness was 1ms.  So this is a real problem.

comparing netsted irqs to a context switch is a red herring.

nested irqs statistically do good, with long irq handlers vs short irq
handlers. The irq handlers that really know to be extremely quick aren't
forced to re-enable irqs, so they can enforce no-nesting by themself.
Enforcing it globally sounds bad to me.
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