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    SubjectRe: CFS review
    On Tue, Aug 28, 2007 at 10:02:18AM +0200, Ingo Molnar wrote:
    >
    > * Xavier Bestel <xavier.bestel@free.fr> 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.

    Willy

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