Re: A few questions and issues with dynticks, NOHZ and powertop

[Paul E. McKenney]

On Mon, Apr 05, 2010 at 09:07:33AM -0700, Arjan van de Ven wrote:
> On 4/5/2010 8:14, Paul E. McKenney wrote:
> >So the main issue is that for many workloads, it is best to run full bore
> >and get done quickly, thus allowing the entire machine to be powered down?
> 
> yep
> 
> >If so, it seems likely that there would be some workloads that were sometimes
> >unable to use all the CPUs, in which case shutting down (idling, offlining,
> >dyntick-idling, whatever) the excess CPUs might nevertheless be the right
> >thing to do.
> 
> but the point is that the normal scheduler + idle behavior gives you exactly that
> in a natural way !
> If you don't have enough work (tasks) to keep all cores busy, the others are and stay idle.

So your earlier objection was not to dyntick-idle as such, but rather
to artificially constraining the scheduler to induce dyntick-idle?

						Thanx, Paul
--
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/