On 31 July 2015 at 08:54, Simone Ciccia S210664 <[email protected]> wrote: > > I'm experiencing issues with my HACK RF just feeding samples in a > simple gnuradio flowgraph, HACK-RF SOURCE -> NULL SINK, in Linux 12.04LTS > > For sample rate above 10MHz I get continuous Overrun ("O").
This is a sign that the HackRF is producing samples at a faster rate than the host can process. > Hack RF is interfaced with the PC through the USB 3.0 port, and the tests on > it (i.e. with hackrf_transfer) indicates that works correctly at 20MHz. Some USB 3.0 ports have poor USB 2.0 performance, but as hackrf_transfer works correctly, I would expect that your port is working correctly at high speed. > Searching for the problem I found it could be the Linux buffer size, > thus I set the file sysctl.conf as follows, These are network buffers, so they are not related to the HackRF (these adjustments probably solve a problem for USRP2 or other network attached SDR hardware). > Anyone have already encountered/solved such issue? My normal suggestion would be to use a more simple flowgraph, but yours is about as simple as it gets. How powerful is the host? Using gnuradio for "HackRF source -> null" is more heavyweight than using hackrf_transfer to achieve the same, so perhaps that is making the difference? Have you tried other sample rates? e.g. 16MHz? _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
