Hi all,
when working with RFNoC at 200 MSps on the X310 using 10GbE I experience
overruns when using less than 512 samples per packet (spp).
A simple flow graph [RFNoC Radio] -> [RFNoC FIFO] -> [Null sink] with the
spp stream arg set at the RFNoC Radio block shows the following network
utilization:
spp | throughput [Gbps]
------------------------
1024 | 6.49
512 | 6.58
256 | 3.60
64 | 0.70
Although I understand that the total load will increase a little bit for
smaller packets due to increased overhead (headers) as seen from spp=1024
to spp=512, I find it confusing that so many packets are dropped for spp <=
256.
Total goodput should be 200 MSps * 4 byte per sample (sc16) = 800 MBps =
6.40 Gbps.
Is RFNoC somehow limited to a certain number of packets per second
(regardless of their size)?
Could this be resolved by increasing the STR_SINK_FIFOSIZE noc_shell
parameter of any blocks connected to the RFNoC Radio?
I would like to use spp=64 because that is the size of the RFNoC FFT I want
to use. I am using UHD 4.0.0.rfnoc-devel-409-gec9138eb.
Any help or ideas appreciated!
Best,
Sebastian
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