Mupen64plus choppy sound on Ubuntu 9.10

[Nico]

I've got a strange and very annoying problem with mupen64plus: the
system I want to use it on some games run fine but some are stuttering
with choppy sound. Mario Kart runs fine mostly (some crackling sound)
but Hot Weels Turbo Racing runs slow, choppy with interupted sound,
especially when there is more then one car in sight.

System: Asrock ION 330, Intel Atom N330, Ubuntu 9.10, Kernel 2.6.31-19-
generic #56-Ubuntu SMP Arch: x86_64 GNU/Linux

What I tried:

Different versions of mupen64plus: 1.5, 1.99-1, 1.99-3 and compile
from hg: no difference, same sound problems.

Different SDL solutions:
I have tried libsdl1.2debian-alsa, libsdl1.2debian-esd,
libsdl1.2debian-oss and libsdl1.2debian-pulseaudio with the
appropriate settings for $SDL_AUDIODRIVER set. No solution.

This CPU has four cores. Mupen64plus uses one of them. When the sound
stutters, the cpu use of that core reaches 100 %.

A different system with much older hardware, same 9.10 Ubuntu and
AMD64 has no problems at all.

Anyone got a clue?

[Richard Goedeken]

Sorry, but your CPU just isn't fast enough to run all the games at full speed.
That Atom 330 is actually impressive for only 8 watts of power, but it's much
simpler and less capable than desktop CPUs. Mupen64Plus only uses 1 CPU, so
it can't take advantage of the multiple cores. One thing that you can do to
get more performance is use the 32-bit version of Mupen64Plus, because it is
somewhat faster than the 64-bit version.

Richard

[mattm...@gmail.com]

how fast is that cpu ? mupen64plus mostly worked on my old pentium 3 @
797 Mhz but the sound was choppy.

i also noticed sound was ( need to test current version still ) was choppy
on my new computer when the cpu scaling was enabled. to fix i usually had
to set the minimum to 1.8 Ghz. 1 Ghz should be fine but seems there was
or is an odd buffer filling issue, because the cpu will usually not be
maxed out and game play would be ok.

how fast is that cpu ?

matt

[Richard Goedeken]

You can't measure performance between different CPUs just by comparing
frequency. A 2.2 GHz Opteron has better performance than a 3.8 GHz Pentium 4.

[mattm...@gmail.com]

797 mhz p3 almost ran mupen64plus mario64 and zelda oot fine. i got
similar results on my amd 4850e set at 1 Ghz. the emu seemed fine, the
cpu did not seem maxed out, and the sound was choppy. ill verify again.

matt

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