Hi, Kamil, Thanks for reaching out. After short sync with our performance team, I can tell we did not observe such anomality and it seems to be some local server issue/configurations.
Regards, Maayan Kashani > -----Original Message----- > From: Kamil Vojanec <voja...@cesnet.cz> > Sent: Thursday, 3 April 2025 14:28 > To: dev@dpdk.org > Cc: Jan Viktorin <vikto...@cesnet.cz> > Subject: ConnectX-7 performance anomaly > > Hello, > > while benchmarking the Nvidia ConnectX-7 400Gbe NIC, I encountered some > interesting behavior: when processing short packets (72 B), the maximum > packet rate I can achieve is 230 Mpps. However, when I increase the > packet size to 512 B briefly and then bring the packet size down to 72 B > again, the maximum throughput is now 260 Mpps and seems to stabilize at > that value. According to the Nvidia performance report > (https://fast.dpdk.org/doc/perf/DPDK_24_07_NVIDIA_NIC_performance_re > port.pdf), > the maximum achievable packet rate of ConnectX-7 NICs is 266 Mpps and > that is what I am trying to reproduce. I have observed this behavior > with dpdk-l3fwd as well as with my own DPDK application. > > My setup is as follows: > > CPU: AMD EPYC 9554P 64-Core Processor > > Application commandline: > > sudo dpdk_example_l3fwd -a0000:05:00.0 -l0-32 --main-lcore=32 -- -p0x1 > --config > "(0,0,0),(0,1,1),(0,2,2),(0,3,3),(0,4,4),(0,5,5),(0,6,6),(0,7,7),(0,8,8),(0,9,9),(0,1 > 0,10),(0,11,11),(0,12,12),(0,13,13),(0,14,14),(0,15,15),(0,16,16),(0,17,17),(0,1 > 8,18),(0,19,19),(0,20,20),(0,21,21),(0,22,22),(0,23,23),(0,24,24),(0,25,25),(0,2 > 6,26),(0,27,27),(0,28,28),(0,29,29),(0,30,30),(0,31,31)" > --eth-dest=0,00:10:94:00:00:02 > > Generator: Spirent 400G generator > > Would anyone be able to share some insight as to what might be happening > here? > > Kamil Vojanec > CESNET z.s.p.o.
