Messages in this thread | | | Subject | Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2 | From | Mike Galbraith <> | Date | Tue, 13 Mar 2007 06:10:39 +0100 |
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On Tue, 2007-03-13 at 09:51 +1100, Con Kolivas wrote: > On 13/03/07, Mike Galbraith <efault@gmx.de> wrote:
> > As soon as your cpu is fully utilized, fairness looses or interactivity > > loses. Pick one. > > That's not true unless you refuse to prioritise your tasks > accordingly. Let's take this discussion in a different direction. You > already nice your lame processes. Why? You already have the concept > that you are prioritising things to normal or background tasks. You > say so yourself that lame is a background task. Stating the bleedingly > obvious, the unix way of prioritising things is via nice. You already > do that. So moving on from that...
Sure. If a user wants to do anything interactive, they can indeed nice 19 the rest of their box before they start.
> Your test case you ask "how can I maximise cpu usage". Well you know > the answer already. You run two threads. I won't dispute that. > > The debate seems to be centered on whether two tasks that are niced +5 > or to a higher value is background. In my opinion, nice 5 is not > background, but relatively less cpu. You already are savvy enough to > be using two threads and nicing them. All I ask you to do when using > RSDL is to change your expectations slightly and your settings from > nice 5 to nice 10 or 15 or even 19. Why is that so offensive to you?
It's not "offensive" to me, it is a behavioral regression. The situation as we speak is that you can run cpu intensive tasks while watching eye-candy. With RSDL, you can't, you feel the non-interactive load instantly. Doesn't the fact that you're asking me to lower my expectations tell you that I just might have a point?
> Please don't pick 5.none of the above. Please try to work with me on this.
I'm not trying to be pig-headed. I'm of the opinion that fairness is great... until you strictly enforce it wrt interactive tasks.
-Mike
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