On Thu, 27 Dec 2018 07:46:57 +0100, S.j. Wang wrote: > > I still have two questions: > 1. It seems the no-period-wakeup feature should be dropped for it isn't recommended > By alsa, right? I still found some driver in kernel support it, what's the reason? > > 2. Shall we add this option in aplay for it is feature that alsa support, even it is optional? As Sakamoto-san already mentioned, no-period-wakeup is nothing but an optional feature for very specific applications and setup, and it's still valid and useful. The condition to use this option is: - If a hardware may perform DMA continuously on a ring buffer (a la free-wheel mode), and - Application doesn't need the wakeup from kernel at each PCM period, but it manages the stream transfer timing by itself. aplay doesn't satisfies the latter, hence adding such a command line option makes no sense. But, it doesn't mean that no-period-wakeup is useless. It can work well for specific applications like PulseAudio. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
