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

[Andrea Arcangeli]

On Wed, Oct 20, 2004 at 12:55:17PM -0400, Lee Revell wrote:
> This was not my point, I agree that the two have nothing to do with each
> other.  But if a hardirq handler runs for 3ms then no user code can run
> for 3ms.  Therefore this is a problem if our goal for desktop response
> is 1ms.

I sure agree it's a problem, but not always userspace code needs to run
for the user not to notice. With ring buffers in the kernel for playback
all you need is a nested irq for the user not to notice skips.
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