The follow is our equipment list:
200g mellanox network card: CX6141105A ConnextX-6 200GbE
two card.
PC: Two computers are used to install 200g network card.CPU processor:AMD Ryzen 5 5600x 6-Core Processor 3.69GHz. PC Memory size: 8G
200G QSFP58 CR4 DAC Cable: One
We use iper3 to test the 200G Mellanox network card’s speed and bandwidth, But find the Transfer rate and Bandwidth less than 200G? The following is the screenshots of the process
Hi Li,
I would recommend not to use -b option which limits the bandwidth to 100Gbs from the screenshot provided.
We recommend using iperf and iperf2 and not iperf3. iperf3 lacks several features found in iperf2, for example multicast tests, bidirectional tests, multi-threading, and official Windows support. For testing our high throughput adapters (100GbE), we recommend to use iperf2 (2.0.x) in Linux and NTTTCP in Windows.
Please refer to the documentation below on how to test performance with iperf and run the iperf with 8-16 threads on step #4:
https://community.mellanox.com/s/article/howto-install-iperf-and-test-mellanox-adapters-performance
In addition, please make sure your servers are tuned according to our recommendations, below please review the article on our community site :
https://community.mellanox.com/s/article/performance-tuning-for-mellanox-adapters
If after reviewing the documentations above and you still have issue with the link speed/bandwidth issue, please open a support case and we will provide further assistance. If you do not have a current support contract, please email the Nvidia team at Networking-contracts@nvidia.com to set up a valid support contract.
Thank you,
Nvidia Networking Support
