[USRP-users] B210 simultaneous Tx and Rx at 32 MS/s

Marcus D. Leech mleech at ripnet.com
Wed Nov 29 10:15:17 EST 2017


On 11/29/2017 05:07 AM, Joan Olmos wrote:
> Thanks Marcus for your response.
> I know my setup is asking for about 1Gbit/s USB bit rate in both 
> directions. But this should be supported by USB 3.
> I'm not familiar with the best USB 3 controllers for USRP.
> The hardware is an ASUS mother board (model H170M-PLUS).
> I'm using the standard kernel modules that come with Debian 9 (stretch).
> This is the info I can get about the USB 3 controller (I send you the 
> output of "lsusb -v").
> I don't fully understand the output, but it seems that the USRP 
> reports a maximum packet size of 1024 bytes.
> I'm configuring the Tx/Rx streamers with "spp=2044"complex samples per 
> packet and "otw_format=sc16" (4 bytes per complex sample) => 8176 
> bytes per packet ... Could this be a problem?
It is the case that not all USB 3 host controllers are of equal quality 
and performance, which is why I asked.

Something you might try is to specify:

num_recv_frames=128
num_send_frames=128

In your device arguments, and see if that makes a difference.

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