[USRP-users] Overrun on 56MHz with B210

Jason A. Donenfeld Jason at zx2c4.com
Sat Apr 18 10:17:46 EDT 2015


Hi folks,

I'm running a B210 over USB3. I seem to be getting buffer overruns
when asking for the maximum 56MHz of bandwidth. For example:

zx2c4 at thinkpad ~/Desktop/sdr $ osmocom_fft -a
uhd,master_clock_rate=56e6 -s 56e6 -f 420e6 -F
linux; GNU C++ version 4.9.2; Boost_105600; UHD_003.008.002-0-unknown
gr-osmosdr v0.1.4-16-g61184a19 (0.1.5git) gnuradio v3.7.6.1-103-g8ecfd13a
built-in source types: file rtl rtl_tcp uhd
-- Operating over USB 3.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 56.000000 MHz
-- Actually got clock rate 56.000000 MHz
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
-- Using subdev spec 'A:A A:B'.
[+] Selected device: Quadro K2000M
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO.....[repeated enormous amounts]

Incidentally, when it's overrunning, I can hear a high pitched
capacitor noise inside of my laptop (Thinkpad W530, Intel i7-3820QM,
C210 chipset), which is a bit funny. Is it possible that the system's
USB controller is simply not up to task? Or is this a configuration
issue I can address?

Thanks,
Jason




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