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