[alsa-devel] Underrun errors in aplay

I have written a driver for Alsa and I think the sound is correct but I do get underrun errors. I don't understand how aplay would know if I am starved. This doesn't make sense to me. I would only think that the driver should know about underruns but maybe I am confused with this.

I am wondering if I am calling snd_pcm_period_elapsed too often. I am calling that when I have free H/W buffers. Thanks, Bruce