Environment:
CPU: Intel(R) Xeon(R) 6960P
OS: Ubuntu 22.04
NIC PN: MCX75310AAS-NEAT
Driver: MLNX_OFED_LINUX-23.10-3.2.2.0
Firmware: 28.41.1000 (MT_0000000838)
Problem:
The bandwidth does not meet specification in 1 to 1 ib_write_bw test. The receiver nic continuously send pfc pauses cause a rdma write bw drop to about 220Gb/s with DCQCN and PFC；Performance better when turn to RTTCC and PFC but still under expectation.
Performance result with DCQCN and PFC:
PFC statistics on ethernet switch(not from nvidia) with DCQCN+PFC
Performance result with RTT-CC and PFC
PFC statistics on ethernet switch(not from nvidia) with RTT-CC+PFC
