On Fri, 2014-12-19 at 18:36 +0500, Alexander E. Patrakov wrote: > 19.12.2014 18:15, Tanu Kaskinen wrote: > > On Thu, 2014-12-11 at 21:49 +0900, ê¹?ì ?ì?° wrote: > >> Dear developers, > >> > >> > >> I have question something about selecting logic between timer-based > >> and IRQ scheduling. > >> > >> When I tried to load 'module-alsa-sink' with 'mmap=0 tsched=1' > >> parameters, tsched(timer-based scheduling) becomes disabled by below > >> codes. > >> > >> It seems tsched is allowed only mmap supported ALSA devices. Why > >> tsched disabled while use non-mmap driven ALSA? > > > > Because rewinding is not available in non-mmap mode. That is, it's not > > possible to rewrite previously written data in non-mmap mode. In > > timer-based scheduling mode PulseAudio uses bigger buffer size, which > > causes problems if rewinding isn't available. > > Sorry, rewinding is actually available in non-mmap mode. And, pulseaudio > can rewind even without tsched (i.e., tsched == 0 does not imply > max_rewind == 0). So the reasoning must be different. But I don't know > the answer. Thanks for the correction. I don't have an alternative theory either. -- Tanu
