[mythtv-users] Re: HDTV performance in 0.18

[Preet Khalsa]

On Tue, 2005-19-04 at 11:07 +0200, Axel Thimm wrote:
> On Mon, Apr 18, 2005 at 11:27:02PM -0400, Preet Khalsa wrote:
> > On Tue, 2005-19-04 at 02:55 +0200, Axel Thimm wrote:
> > > On Mon, Apr 18, 2005 at 03:38:53PM -0700, Big Wave Dave wrote:
> > > > On 4/18/05, Brandon Beattie <brandon+myth at linuxis.us> wrote:
> > > > > MythTV is often compiled with no support for MMX or anything
> > > > > more than pentium pro optimization.  If you didn't enable
> > > > > processor specific optimization and mmx, and opengl when doing
> > > > > a ./configure then this could have the bad effect.  I haven't
> > > > > noticed much if any CPU change between .17 and .18 (Granted I
> > > > > run out of CVS) so I'd check that first.
> > > > > 
> > > > 
> > > > Does anyone know how the ATRpms are compiled, in this respect?
> > > 
> > > Depends on the distribution, for FC3 they are tuned for pentium4.
> > 
> > Does this mean I should compile Myth for the x86_64 (AMD64) instead of
> > just using the binaries?  (yes I did get the x86_664 version)
> 
> Oh no, sorry. The x86_64 packages are of course not optimized for
> pentium4, gcc would bail out if told so. Here are the typical
> optimization flags for x86 archs and compatibles on FC3 packages:
> 

<snip>

> You can rebuild the packages with different optflags, if you like, to
> see whether there is any difference. Note that on x86_64 MMX in mythtv
> does not compile, so you will see a considerable performance drop wrt
> i386. Perhaps trying the i386 packages would not be a bad idea.

That is an interesting idea.  Maybe that is the solution.  I have been
trying to avoid i386 on this machine but had to relent for OpenOffice
and Firefox.  My only question about this is how the nvidia drivers
relate.  I have the x86_64 version of the drivers and I wonder how Myth
can handle that.  Particularly for XvMC.

Thanks Axel!