Thanks a lot. I didn't notice that the emails were incorrect in the original email.
> -----Original Message----- > From: Dariusz Sosnowski <dsosnow...@nvidia.com> > Sent: Monday, April 28, 2025 3:01 PM > To: Bing Zhao <bi...@nvidia.com>; Slava Ovsiienko > <viachesl...@nvidia.com>; 韩康康 <961373...@qq.com>; Ori Kam > <or...@nvidia.com> > Cc: users@dpdk.org > Subject: RE: net/mlx5: mellanox cx5 experiences "rx_phy_discard_packets" > under low bandwidth conditions. > > Adding correct mail addresses for users mailing list and to Ori Kam. > > > From: Bing Zhao <bi...@nvidia.com> > > Sent: Monday, April 28, 2025 9:00 AM > > To: Slava Ovsiienko <viachesl...@nvidia.com>; 韩康康 <961373...@qq.com>; > > Dariusz Sosnowski <dsosnow...@nvidia.com>; orika <or...@nivida.com> > > Cc: users <us...@dpdk.com> > > Subject: RE: net/mlx5: mellanox cx5 experiences "rx_phy_discard_packets" > under low bandwidth conditions. > > > > Hi Kangkang, > > > > Please take the DPDK performance report and the configurations under DOC > link of dpdk.org for a reference. > > It shows how to configure the HW and how to run the testpmd / l2fwd for > SCP / ZPL testing. Or searching for the DPDK testing white paper from CTC > as well(中国电信DPDK测试白皮书). > > In the docs, the NUMA / PCIe / lcore affinity / queue depths will all be > explained inside. > > > > From: Slava Ovsiienko <mailto:viachesl...@nvidia.com> > > Sent: Monday, April 28, 2025 1:57 PM > > To: 韩康康 <mailto:961373...@qq.com>; Dariusz Sosnowski > > <mailto:dsosnow...@nvidia.com>; Bing Zhao <mailto:bi...@nvidia.com>; > > orika <mailto:or...@nivida.com> > > Cc: users <mailto:us...@dpdk.com> > > Subject: RE: net/mlx5: mellanox cx5 experiences "rx_phy_discard_packets" > under low bandwidth conditions. > > > > Hi, > > > > First of all, please, increase the number of queues and handling cores. > For 100GBps link from 4 to 8 queue/cores usually are needed. > > Also, you can try combinations of multiple queues per core (2..4 queues > handled by one core). > > And there are the offload options “inline” and mprq might be useful to > gain the wire speed for the small packets. > > Please see the Nvidia/Mellanox performance reports > (https://core.dpdk.org/perf-reports/) for the details. > > > > With best regards, > > Slava > > > > From: 韩康康 <mailto:961373...@qq.com> > > Sent: Friday, April 25, 2025 1:36 PM > > To: Dariusz Sosnowski <mailto:dsosnow...@nvidia.com>; Slava Ovsiienko > > <mailto:viachesl...@nvidia.com>; Bing Zhao <mailto:bi...@nvidia.com>; > > orika <mailto:or...@nivida.com> > > Cc: users <mailto:us...@dpdk.com> > > Subject: net/mlx5: mellanox cx5 experiences "rx_phy_discard_packets" > under low bandwidth conditions. > > > > > > You don't often get email from mailto:961373...@qq.com. > > https://aka.ms/LearnAboutSenderIdentification > > > > Hi all, > > I am using dpdk-testpmd and pkt generator to test bandwith according to > RFC2544. > > However, I observed that CX5 rx_phy_discard_packets at low bandwith, > resulting in abnormal measurements under zero packet loss conditions. > > > > dpdk version: dpdk-21.11.5 > > ethtool -i enp161s0f1np1: > > driver: mlx5_core > > version: 5.8-6.0.4 > > firmware-version: 16.32.1010 > > Hardware: AMD EPYC 7742 64-core Processor > > dpdk-testpmd: > > dpdk-testpmd -l 96-111 -n 4 -a 0000:a1:00.1 -- -i --rxq=1 --txq=1 > > --txd=8192 --rxd=8192 --nb-cores=1 --burst=128 -a --mbcache=512 --rss- > udp test result: > > frame size(bytes) offerd Load(%) packet loss rate > > 128 15.69 0.000211 > > 256 14.148 0.0004 > > 512 14.148 0.00008 > > 1518 14.92 0.00099 > > > > i'd like to ask, is this an issue with CX5 NIC? How can i debug it to > eliminate the packet drops? > > > > 韩康康 > > mailto:961373...@qq.com >
