* Roman Zippel <[email protected]> wrote:
> On Mon, 16 Jul 2007, Ingo Molnar wrote:
>
> > > As soon as you add another loop the difference changes again,
> > > while it's always correct to say it gets 25% more cpu time [...]
> >
> > yep, and i'll add the relative effect to the comment too.
>
> Why did you cut off the rest of the sentence?
(no need to become hostile, i answered to that portion of your sentence
separately, which was logically detached from the other portion of your
sentence. I marked the cut with the '[...]' sign. )
> To illustrate the problem a little different: a task with a nice level
> -20 got around 700% more cpu time (or 8 times more), now it gets 8500%
> more cpu time (or 86.7 times more). You don't think that change to the
> nice levels is a little drastic?
This was discussed on lkml in detail, see the CFS threads. It has been a
common request for nice levels to be more logical (i.e. to make them
universal and to detach them from HZ) and for them to be more effective
as well.
Ingo
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