[Kwintv] Re: kdenonbeta/kwintv3/qtvision/plugins/video/v4l

[Zack Rusin]

On Wednesday 07 January 2004 19:08, George Staikos wrote:
> On Wednesday 07 January 2004 18:23, Dirk Ziegelmeier wrote:
> > CVS commit by dziegel:
> >
> > v4lplugin: Preselect fastest available display method as default on
> > first start
> >
> > +    // select best method available as default
> > +    int bestAvailable = QVIDEO_METHOD_XVSHM;
> > +    if (!_vs->haveMethod(bestAvailable)) {
> > +        bestAvailable = QVIDEO_METHOD_XV;
> > +    }
>
>    You know, the last time I tested I found that XV was faster than
> XVSHM. Perhaps it was implementation flaws that have since been
> fixed, or perhaps I had a weird X server or weird hardware, but it
> could be true that XVSHM isn't all that great.  How does it perform
> for you?

Most likely it's a MTRR problem. Did you run x11perf --shmput500 to see 
what results you're getting? Compare them to a normal x11perf 
--putimg500.  Shm should always perform faster.

Zack

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