[mythtv-users] Re: Playback of Transcoded (MPEG4) file on Epia ME6000

[Ivor Hewitt]

The gcc compiler hasn't got any scheduling logic for the c3 since via
hasn't released that information or contributed to the gcc
development..... and since the c3 design is based off the old cyrix
dies I suspect that the 586 optimisations might be a reasonable match.

-Os is all very well but that just tries to pack everything into the
smallest space and so disables all word alignment and doesn't try to
optimise the code for speed. -O2 seems like a reasonable compromise
for the c3. It doesn't unroll loops but does do some optimisations.

Personally I always found "586 and -O2" gave decent performance...
with the added benefit I can use the same binaries on P3, C3 and C3-2
which helps testing and debugging (for me).

If I have time I might run some benchmarks with different options.


On 4/22/05, Devan Lippman <devan.lippman at gmail.com> wrote:
> I'd have to agree with Ivor's flag settings, I've found on my TC that
> i586 works better than C3
> 
> On 4/22/05, Ivor Hewitt <ivor.hewitt at gmail.com> wrote:
> > On 4/22/05, Neale Swinnerton <mythtv-users.spam at isismanor.com> wrote:
> > > Hi,
> > >
> > > I've got a Epia ME6000 working well as a Myth frontend. I've got the
> > > XvMC playback so that watching Live TV or recordings is great (I've got
> > > a backend with 2 x Hauppauge DVB-T cards).
> > >
> > 1. I'd have thought an m6000 would struggle. Out of interest what cpu
> > load are you seeing in mplayer?
> > 2. Why are you transcoding dvb-t recordings anyway? do you really need
> > to save disk space that badly. Wouldn't you rather watch the original
> > quality?
> > 
> > > -march=c3 -Os -fomit-frame-pointer
> > >
> > What about just -march=i586 -O2
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> > 
> 
> 
> -- 
> Thanks,
> Devan Lippman <devan at lippman.net>
>