On Mon, Oct 18, 2010 at 08:37:33PM -0400, Marcus D. Leech wrote: > I've noticed latency issues with one of the applications I'm working on. > Latencies of up to tens of seconds > have been observed, which I tried to combat by specifying > recv_buff_size in the parameter list. > > Right now, I'm running with 4096 bytes, which at 400Ksps, gives me a > roughly 1 second latency between > input and output (where output is both an audio sink, and a couple of > different file sinks as well as a > scopesink2, and an FFT sink). But increasing it beyond 4096 bytes > causes the latency to go up very > quickly, and if I drop it to 1024 bytes, I start seeing over-runs. If > you do the math, however, 4096 bytes is > nowhere near 1 second worth of buffer. One second is 1.6Mbytes > (400Ksps x 4bytes per sample).
Since you've got a usrp* source and an audio_sink, what you're seeing could be related to the two different clocks in the flow graph. Do you see the problem if the audio_sink is NOT in the graph? Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
