Hello, I have a USRP N310 and in my application I want to do a 4 channel loopback. Transmit sources are files and the received samples are processed. However, I ran into stability issues receiving a lot of Late packet errors (LLLLL). To trace the problem I executed the basic UHD example txrx_loopback_to_file on 4 channels with 1Msamp/sec sample rate. There every time I got ERROR_CODE_LATE_COMMAND. When I executed it for 3 channels I got it working, though on some occasions the same error would occur. With netstat I see that in case I receive the L-s, the UDP packet error is increasing.
After reading through the manual and threads I tried several things but could not resolve the issue. - I set the net.core.rmem_max and wmem_max as suggested - I set the MTU on both host and N310 to 8000 (also tried 1500) - I put the CPU to performance mode with cpupower My system config is: - Ubuntu 20.04, UHD version 3.15, (gnuradio installed with apt) - quad core intel n4200, 8GB RAM - N310 is loaded with default HG firmware (sfp0 is 1GBit) Do you have any tips on how to resolve this? Thanks! Balint
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