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

Mike Galbraith
2007-03-12T07:23:08Z

On Sun, 2007-03-11 at 13:10 +0100, Ingo Molnar wrote:
> * Mike Galbraith <efault@gmx.de> wrote:
>
> > > Full patch for 2.6.21-rc3-mm2:
> > > http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3-mm2-rsdl-0.29.patch
> >
> > I'm seeing a cpu distribution problem running this on my P4 box.
>
> > With 2.6.21-rc3, X/Gforce maintain their ~50% cpu (remain smooth), and
> > the encoders (100%cpu bound) get whats left when Amarok isn't eating
> > it.
> >
> > I plunked the above patch into plain 2.6.21-rc3 and retested to
> > eliminate other mm tree differences, and it's repeatable. The nice 5
> > cpu hogs always receive considerably more that the nice 0 sleepers.
>
> hm. Do you get the same same problem on UP too? (i.e. lets eliminate any
> SMP/HT artifacts)

Behavior is slightly different with a UP kernel. Neither encoder
receives more cpu than X, but they each still receive more than gforce.
The distribution of X/Gforce vs lame/lame averages per eyeball to
roughly ~50:50.

I noticed Con posted an accounting fix, and applied it. No change.

-Mike