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

[Zwane Mwaikambo]

On Wed, 20 Oct 2004, Lee Revell wrote:

> Are these really "priorities" in real life?  I am not being facetious,
> this is actually a common myth among users, that you will get better
> performance by putting the device you care about on a "high priority"
> irq or tweaking the priorities in your local APIC.  My impression was
> that this is pointless because it only determines which interrupt the
> CPU sees first if they fire at _exactly_ the same time.  Since we allow
> interrupt to nest this does not matter in practice, right?

Yep, it only affects which vector gets dispatched first in the multiple 
vectors queued scenario which doesn't really matter with nesting as you 
noted.

	Zwane

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/