Messages in this thread | | | Date | Mon, 2 Jan 2006 10:50:56 +0100 | From | Paolo Ornati <> | Subject | Re: [SCHED] wrong priority calc - SIMPLE test case |
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On Mon, 02 Jan 2006 10:15:43 +0100 Mike Galbraith <efault@gmx.de> wrote:
> >This is the bad situation I hate: some cpu-eaters that eat all the CPU > >time BUT have a really good priority only because they sleeps a bit. > > Yup, your proggy fools the interactivity estimator quite well. This > problem was addressed a long time ago, and thought to be more or less > cured. Guess not.
In my original real-life test case (transcode) I found that the problem started with the removing of "interactive_credit":
http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/6aa5c93c379ae9e1/a9a83db6446edaf7?lnk=st&q=insubject%3Asched+author%3APaolo+author%3AOrnati&rnum=1&hl=en#a9a83db6446edaf7
This is not actually true... in fact that change only unhidden the problem for that particular test-case.
With my little proggy I'm now able to reproduce the problem even with "interactive_credit" applied (for example with a 2.6.10 kernel).
Said this, and since "nicksched" doesn't have this problem at all, it is an ingosched (and others as well) problem.
-- Paolo Ornati Linux 2.6.15-rc7-plugsched on x86_64 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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