On 2021-11-29 18:22, Jonathan Pratt wrote:
We are looking to develop a standalone sdr platform connecting an
nVidia Jetson AGX Xavier to a USRP X310. The X310 has two dual
receiver boards installed but we are only trying to stream data from
one core at this time.
The Xavier is an octacore ARM platform with all cores enabled and
running close to 1.5GHz.
The connection between the two devices is via ethernet running at
1Gbit. The xavier has a x16 PCIe interface connector and we are using
a NIC with 1Gbps SFP module – we intend to run the link at 10Gbit in
the future. The onboard 1Gbps ethernet is connected to our LAN
The Xavier is running ubuntu 18.04 for arm. This is the development
platform that nVidia provides. uhd 4.0.0, gnuradio 3.8 and RfNoC 4
have been installed on the Xavier.
The Xavier is given a simple flow to run under gnuradio-companion
which consists of a USRP Source connected directly to the QT GUI
Frequency sink (or Null Sink)
The network buffers and mtu on the xavier are increased to at least
those recommended.
The result we get is a whole lot of ‘D’s output if we increase the
sample rate beyond 2MSPS. The same result is found if we run the flow
from the command line (without the gui).
For comparison we have done a similar setup with a USRP E312 –
connected to a xavier, a ubuntu 20 virtual machine and directly to a
computer running ubuntu 20.04. In each case when we increase the
sample rate beyond 2MSPS we get ‘O’s output.
Can anyone please indicate what setup is required to achieve the
25MSPS that should be possible across this link?
Thanks in advance
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You might want to run "benchmark_rate" from the UHD examples code to
eliminate GR entirely at first--just to get a feel for what your machine
is capable of.
I'll note that the "network mode" in E312 (where it streams to a regular
PC) has *considerable* performance constraints, and achieving even 2Msps
is a bit of a
miracle.
The X310, on the other hand, is Niagara Falls. Any
streaming-performance issues are your host. The FPGA on the X310 can
stream to the xGIGe interfaces as fast as
physics allows, pretty much.
For a "order of magnitude" benchmark, I can achieve 10Msps from a B2xx
into an Odroid XU4Q with 8-bit samples (there's a USB bandwidth issue
there). I can even
"do stuff" at 10Msps, including several different radio astronomy
signal processing chains. I would expect your Xavier to be similar.
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