2007/1/30, Krischan Keitsch <[EMAIL PROTECTED]>:
Am Montag, 29. Januar 2007 09:08 schrieb Kalle Vahlman:
> 2007/1/29, Krischan Keitsch <[EMAIL PROTECTED]>:
> > Hi
> >
> > as far as I can tell the n800 with the OMAP2420 processor has a vfp
> > (vector floating point unit; see [1] ) Based on this I wanted to find out
> > if vorbis could take advantage of this unit by default.
> >
> > To make it short: Yes it works - BUT it is just painful!
>
> [...]
>
> > Conclusion:
> > It works but the cpu load is high. Vorbis decoding takes almost 80% cpu.
> > I also tried MPlayer 1.0rc1-maemo.8 which has the integer based Tremor
> > decoder codec [4] nicely integrated. Tremor needs around 12% cpu for the
> > same ogg file. (That is an expected scale up from the 770 experience -
> > tremor takes around 20% cpu on the 770 - due to the faster cpu of the
> > n800)
> >
> > It exceeds my skills to analyze this much further. However it seems that
> > the vorbis decoder is not vfp optimized ;-) [yet?].
>
> Did you specify any compiler flags or just compile as-is?
>
> I'm not 100% sure but I've let myself belive (based on comments on the
> IRC channel) that it won't compile with vfp unless you specify
> "-mfpu=vfp -mfloat-abi=softfp" for the compiler. Also based on the
> chatting on #maemo, "-mcpu=arm1136j-s" might be worth it.
I tried again with the flags
mfpu=vfp mfp=vfp mcpu=arm1136j-s
(mfloat-abi=... didn't work)
(I passed the flags to the configure script. Is that the correct way to do
it?)
No, they should be set to the CFLAGS environment variable (for example):
export CFLAGS='-mfpu=vfp -mfloat-abi=softfp -mcpu=arm1136j-s'
and after that run configure and recompile (remember to 'make
clean'!). You should see them in the lines that begin with 'gcc' if
the configure script picked them up properly.
--> No success! It compiled fine but cpu was above 80% and playback got
interruppted quite often. :-(
That sounds strange, if you pass those to the configure script it
should just silently ignore them...
--
Kalle Vahlman, [EMAIL PROTECTED]
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