> What sort of CPU are you using? > > --Colby AMD Phenom II X6 1055T, with 6GB of 1333MT/s memory. Rough ballpark calculations show me that even a 4096-bin FFT shouldn't take more than about 0.45GFlop/sec at 25Msps, and the CPU is easily capable of at least 8GFlop/sec/core. So I'm not sure why it's baffing at 25Msps.
I've tried using both the on-mobo 1GiGE interface, and a PCI-resident one. Neither of those makes any difference to getting large numbers of 'O' at 25Msps. If I decimate by 3 or more before the FFT (after vectorizing), I runs OK, consuming about 40% of the total system CPU, and not producing any 'O'. I could then, theoretically, process the FFT output vector to extract only the magnitudes of the bins that correspond to my channels of interest. But decimating by 3 means that I'm losing sensitivity by a factor of sqrt(3), which I'd rather not have to "swallow", the application is for radio astronomy, where sensitivity is quite important. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
