On 10/04/2023 21:12, Jim Schatzman wrote:
The following steps had no impact:
a) Don't use a switch but do a point-to-point connection between the comptuer's
NIC and the N310.
b) Adjust network buffers and ring buffer per recommendations (actually, the
network buffers setting was always being done).
Increasing the MTU to 9000 had a significant impact. An occasionaly underrun is
still experienced, but an hour or two of continuous transmission is possible.
I am wondering if this is not an issue on the computer side but on the radio
side. Is the N310 incapable of supporting 1x 10 Gbps streams with a MTU of
1500? Perhaps.
I will do some computer-to-computer testing to see if the problem can be
reproduced there.
Jim
Even non-SDR applications tend to use jumbo-frames for continuous
traffic at 10Gbit. I'm sorry that I didn't clue in to that
in the first round.
At 08:39 PM 4/7/2023, Marcus D. Leech wrote:
On 07/04/2023 22:13, Jim Schatzman wrote:
We have been unable to estable 100% reliable connections to an N310 USRP radio
through its 10 Gbit ethernet from Linux. What happens is that it works fine for
a period of time - 30 to 60 minutes, typically. Then we see a couple of U's in
the output. Unfortunately, that is fatal for our application.
Using the unmodified tx_samples_from_file or one modified to use separate
threads to read data from the file and to sent it over the socket to the radio,
the symptoms are the same.
All the evidence is that the application is sending data continuously without any delays.
Also, the "network" has no devices on it except for the host computer, a high
performance 10G switch, and the N310 radio.
We are wondering if this could be a Linux "feature". We would like to try
increasing the socket priority with SO_PRIORITY. However, we are not finding any hooks in
the UHD software for this.
Suggestions?
Thanks!
Jim
_______________________________________________
Have you increased the ring buffers on your card?
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks#Increasing_Ring_Buffers
Also, adjust the network buffers:
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks#Adjust_Network_Buffers
Have you tried a direct connection--without the switch?   Just to eliminate it.Â
Before you say "oh, it's not the switch",
 many "high performance" 10G switches have a less-than-ideal switching fabric.
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