Hello,
I am returning to the problem reported a few months ago:
I have two X440s with X_200 image connected to a Threadripper 24 core. I am
using two 10 GbE direct connect cables for each USRP (total of 4x 10 GbE).
I was able to get RX working, but TX is getting continuous underflows.
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Using the benchark_rate example.
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Underflows observed both w/ DPDK and w/out DPDK
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Underflows observed with 4, 8 channels and 16 channels
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Fewer underflows with 4 channels, but still get a few per minute
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Priority high/normal does not make a difference (usually)
IMPORTANT: If I use only one interface (
โargs=addr=192.168.10.2,mgmt_addr=192.168.1.10) there are no underflows with up
to 7 channels (max to fit in 10 GbE).
./benchmark_rate
--args=addr0=192.168.10.2,second_addr0=192.168.11.2,mgmt_addr0=192.168.1.10,addr1=192.168.15.2,second_addr1=192.168.16.2,mgmt_addr1=192.168.1.20,clock_source=external,use_dpdk=1,type=x4xx,product=x440
--tx_channels 0,1,2,3,4,5,6,7 --tx_rate 40.96e6 --tx_cpu sc16 --multi_streamer
--duration 120
This should be trivial for such a powerful machine!
I am suspecting an issue with handling of packets across multiple network
interfaces. Are the TX flow control packets not getting to the right place?
This is a critical failure โ not something I expect for a $35k box ๐
Eugene Grayver, Ph.D.
Principal Engineer
310-336-1274
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