[dpdk-dev] Performance issues with Mellanox Connectx-3 EN

Xu, Qian Q qian.q.xu at intel.com
Thu Aug 13 05:24:53 CEST 2015

So seems the performance bottleneck is not at the core, have you checked that the Mellanox NIC's configuration? How many queues per port are you using? Could you try l3fwd example with Mellanox to check if the performance is good enough? I'm not familiar with Mellanox NIC, but if you have tried Intel Fortville 40G NIC, I can give more suggestions about the NIC's configurations. 


-----Original Message-----
From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Xiaozhou Li
Sent: Thursday, August 13, 2015 7:20 AM
To: dev at dpdk.org
Subject: [dpdk-dev] Performance issues with Mellanox Connectx-3 EN

Hi folks,

I am getting performance scalability issues with DPDK on Mellanox Connectx-3 .

Each of our machine has 16 cores and a single-port 40G Mellanox Connectx-3 EN. We find out the server throughput *does not scale* with number of cores. With a single thread on one core, we can get about 2 Mpps with a simple echo server implementation. However, the performance number does not increase as we use more cores. Our implementation is based on the l2fwd example.

I'd greatly appreciate it if anyone could provide some insights on what might be the problem and how can we improve the performance with Mellanox Connectx-3 EN. Thanks!


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