Good morning to all the mailing list users.
It is about a couple of months that I'm fighting with my N310 for
different reasons.
Now I want to report a couple of strange behaviors I'm observing with
this device. Of course their can be my faults... I hope some one in the
community can make light.
I try be as clear as possible.
My goal: Streaming the 4 RX channels over the two SFP+. Let me say I
want A:0 and A:1 on sfp0, while B:0 and B:1 on sfp1.
Premise: * I'm using 10G link with fibers. I'm sure the network adapter
and fibers work well because they are the same I used with my X310 (and
it works).
* I'm using N310 in legacy compat mode
* The software I use is the same I used for my X310 and
it works (at least with X310 of course!)
* MTU is to 9000 on both the host and N310
* I'm using UHD 3.14.0
Strange behavior 1: when I start my acquisition program I can see (using
tcpdump on the host side) small packets (16 or 24 bytes in size, I think
they are some kind of commands) flowing through, let just say sfp0
iface. If I reboot the N310 and the I start again my program I can see
the same kind of packets flowing through sfp1 (but not through sfp0). If
I reboot the N310 again may be these packets start flowing through sfp0
or sfp1.... it depends!!!! Is that the normal behavior of N310?
Strange behavior 2: in order to start streaming the 4 channels I use
this code:
time_spec_t start_sampling = mUsrp->get_time_now() + 1.0;
uhd::stream_args_t str_args("sc16", "sc16");
str_args.channels.push_back(mChannels[0]);
str_args.channels.push_back(mChannels[2]);
mStreamArgs.push_back(str_args);
uhd::stream_cmd_t
tmp_strcmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
tmp_strcmd.num_samps = 0;
// Timed
tmp_strcmd.stream_now = false;
tmp_strcmd.time_spec = start_sampling;
uhd::rx_streamer::sptr tmp_rx_stream = mUsrp->get_rx_stream(str_args);
tmp_rx_stream->issue_stream_cmd(tmp_strcmd);
mStreamCmds.push_back(tmp_strcmd);
mRxStreams.push_back(tmp_rx_stream);
uhd::stream_args_t str_args2("sc16", "sc16");
str_args2.channels.push_back(mChannels[1]);
str_args2.channels.push_back(mChannels[3]);
mStreamArgs.push_back(str_args2);
uhd::stream_cmd_t
tmp_strcmd2(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
tmp_strcmd2.num_samps = 0;
// Timed
tmp_strcmd2.stream_now = false;
tmp_strcmd2.time_spec = start_sampling;
uhd::rx_streamer::sptr tmp_rx_stream2 = mUsrp->get_rx_stream(str_args2);
tmp_rx_stream2->issue_stream_cmd(tmp_strcmd2);
mStreamCmds.push_back(tmp_strcmd2);
mRxStreams.push_back(tmp_rx_stream2);
It works perfectly with my X310, but with the N310 it starts the
streaming of only a couple of channels (A:0 and A:1 to be precise) and
on sfp0 or sfp1... it depends!!
Of course I miss something (or at least I hope so!). I checked and
double checked examples coming from libuhd repository but there is
nothing specific about the N310.
Any help is appreciated. Thank you in advance.
Of course if more details are necessary, please let me know.
Have a good day
Paolo
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