Hi all, I have lost the afternoon chasing an audio quality issue with PA configured with tsched=0 and small fragments (<30ms). I am doing this on purpose to profile the behavior of PulseAudio with lots of wakeups and samples provided in chunks at once. With the latest 0.9.19 version I have cracking noise but no reports of underflows, it works fine maybe once in 20 trials. With 0.9.15, no issue at all, I can even go down to fragments of 2ms without any issue. This is on a Atom board with classic HDAudio. I have no problem at all in both cases with aplay -Dhw. What I noticed though is that aplay seems to select a period size and buffer size that are multiples of 128 bytes. For example a period of 5ms at 48kHz is actually configured as 5.33ms and 256 frames; I suspect an alignement issue that would cause these noises. I have an intuition that the regression was introduced by the ALSA configuration rewrite SHA:557c4295107dc7374c850b0bd5331dd35e8fdd0f , but before I go on with a dichotomy and try to fix the issue I wanted to check if others faced the same problem. Thanks for your feedback - Pierre
