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. -- Alexander E. Patrakov
