[Discuss-gnuradio] question about overruns with simple flowgraph

[Stephen]

Hi,

I have a simple FM broadcast receiver flowgraph in c++ that causes
overruns. I'm using a B100 with a wbx daughter board. The flowgraph is

usrp source -> lowpass filter -> quad demod -> deemphasis -> audio lp
filter -> constant multiply -> audio sink

The sample rate is 250K. It works but after a couple of seconds the
overruns start. I've used much more complicated flowgraphs than this
with much higher sampling rates with out overruns. Looking at the cpu
utilization shows each core at less than 5%. Would anyone have any
suggestions for what to look at that could be causing the problem?

thanks,
stephen