Keith Chew wrote: > In pcm_dmix_i386.c, we have: > > if (!strncmp(line, "processor", 9)) > smp++; > > I have commented out the smp++, so that it thinks that I am on a uni > processor. Voila, so AV sync issues! > > My question now is what are the implications of this change? Looking > at pcm_dmix_i386.h, it uses locks on an SMP system, but exclude them > if not SMP. Do we still need this lock, even if I am on a dual core, > ie 1 processor 2 cores? Dual-core processors behave like two separate processors, i.e., they still have separate caches, so we still need to synchronize memory accesses to ensure that they happen in the correct order. I'd guess that the memory bus synchronization of the three dmix devices makes the memory accesses too slow. What is the CPU utilization of mplayer with and without SMP? Regards, Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
