On 07/24/2018 03:18 AM, RizThon via USRP-users wrote:
Hi all,
I'm still having issues with a B210 with sample rates greater than
28MS/s. At 28 I get a few overruns out of a million blocks of 1024
samples, but as I sample faster, the number of overruns grow fast.
I have an AMD Ryzen 7 2700 (8 physical cores @ 3.2GHz), 16GB
RAM, Gigabyte GA-AB350N, Windows 10. The USB driver is from
http://files.ettus.com/binaries/misc/erllc_uhd_winusb_driver.zip .
I've tried adding "num_recv_frames=256" but I get an error:
Creating the usrp device with: num_recv_frames=256...
[INFO] [UHD] Win32; Microsoft Visual C++ version 14.0; Boost_106300;
UHD_3.11.0.1-37-g2c9087d1
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 3.
[ERROR] [USB] libusb_session_impl::libusb_event_handler_task:
LIBUSB_ERROR_CODE -1
I would have expected to be able to stream with barely any overrun at
56MS/s on that computer. I stream at that speed in dual channel on a
LimeSDR (in SC12 format).
Any advice on how to get better results?
Thanks.
You cannot stream faster than about 30Msps from the B210 when in
dual-channel mode. This is a limitation of the data bus architecture on
the AD9371 chip, and not strictly a limitation of the B2xx FPGA.
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