* Willy Tarreau <[email protected]> wrote:
> On Tue, Aug 28, 2007 at 10:02:18AM +0200, Ingo Molnar wrote:
> >
> > * Xavier Bestel <[email protected]> wrote:
> >
> > > Are you sure they are stalled ? What you may have is simple gears
> > > running at a multiple of your screen refresh rate, so they only appear
> > > stalled.
> > >
> > > Plus, as said Linus, you're not really testing the kernel scheduler.
> > > gears is really bad benchmark, it should die.
> >
> > i like glxgears as long as it runs on _real_ 3D hardware, because there
> > it has minimal interaction with X and so it's an excellent visual test
> > about consistency of scheduling. You can immediately see (literally)
> > scheduling hickups down to a millisecond range (!). In this sense, if
> > done and interpreted carefully, glxgears gives more feedback than many
> > audio tests. (audio latency problems are audible, but on most sound hw
> > it takes quite a bit of latency to produce an xrun.) So basically
> > glxgears is the "early warning system" that tells us about the potential
> > for xruns earlier than an xrun would happen for real.
> >
> > [ of course you can also run all the other tools to get numeric results,
> > but glxgears is nice in that it gives immediate visual feedback. ]
>
> Al could also test ocbench, which brings visual feedback without
> harnessing the X server : http://linux.1wt.eu/sched/
>
> I packaged it exactly for this problem and it has already helped. It
> uses X after each loop, so if you run it with large run time, X is
> nearly not sollicitated.
yeah, and ocbench is one of my favorite cross-task-fairness tests - i
dont release a CFS patch without checking it with ocbench first :-)
Ingo
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