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    SubjectRe: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2
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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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