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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