Re: [patch] SCHED_SOFTRR starve-free linux scheduling policy

[Mike Galbraith]

At 08:09 AM 7/14/2003 -0700, Davide Libenzi wrote:
>On Mon, 14 Jul 2003, Mike Galbraith wrote:
>
> > At 12:12 AM 7/14/2003 -0700, Davide Libenzi wrote:
> > >On Mon, 14 Jul 2003, Mike Galbraith wrote:
> > > > While testing, I spotted something pretty strange.  It's not 
> specific to
> > > > SCHED_SOFTRR, SCHED_RR causes it too.  If I fire up xmms's gl 
> visualization
> > > > with either policy, X stops getting enough sleep credit to stay at 
> a usable
> > > > priority even when cpu usage is low.  Fully repeatable weirdness.  See
> > > > attached top snapshots.
> > >
> > >RT tasks are pretty powerfull and should not be used to run everything ;)
> > >What I was seeking with this patch was 1) deterministic latency 2) stave
> > >protection.
> >
> > Yes, I know.  I only fired up the cpu hog as a test to see that the
> > protection would kick in.  I did do that too though, ran _everything_...
> > the whole X/KDE beast SCHED_SOFTRR for grins :)
> >
> > I should have reported the strangeness in a different thread, it has
> > nothing to do with your patch.
>
>Did you try the skip resistance test by running XMMS alone with audio ?

Yes, and it worked fine.  No cpu load I tossed at it caused a skip.

         -Mike