I have a flow graph that receives, demodulates and filters a signal
sending it to the audio card. It’s been working in a single board,
core, computer with an audio card ALC888 for months. I occasionally had
underrun messages, specially when changing filter parameters. This
were normally less than 10 and very spread, about every 30 seconds. It
didn’t cause any noticeable noise or problems.
Recently I moved to a better computer with better CPU, 4 cores and a
audio card. The Python script works fine, with no visible bottlenecks in
the processor. However, I now get constant overruns and underruns
making the audio noisy.
The audio card is able to work correctly when using the speaker-test
command so, there isn’t a fault in the hardware. It’s also capable of
running at the required sample rate.
Is there any test I could make to understand and fix this issue? Has
had a bad experience using this audio card with GnuRadio?