Re: PREEMPT_RT vs I-PIPE: the numbers, part 2

From: Andrea Arcangeli
Date: Wed Jun 22 2005 - 18:59:25 EST

On Wed, Jun 22, 2005 at 07:38:27PM -0400, Karim Yaghmour wrote:
> Bare in mind here that what we're trying to find out with such
> tests is what is the bare minimum cost of the proposed rt
> enhancements to Linux, and how well do these perform in their
> rt duties, the most basic of which being interrupt latency.

Agreed. I think it makes more sense to keep comparing it against the UP
kernel with preempt disabled, since most embedded devices aren't smp.

> To be honest, however, I have a very hard time, as a user, to
> convince myself that I should enable preempt_rt under any but
> the most dire situations given the results I now have in front

Same here.
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