Hi Ayshathul Thuhara,

l3fwd parameters in the doc are important: they say how many cores/queues to use.

Try playing with them, adding testpmd specific parameters.

sudo ./build/app/dpdk-testpmd -a 01:00.0 -l 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 -- -i --rxq=16 --txq=16 --nb-cores=16

Regards,

               Ernesto

From: Ayshathul Thuhara <ayshathul.thuhara@iwave-global.com>
Sent: Friday, February 13, 2026 10:04
To: Ernesto Ruffini <eruffini@outsys.org>
Cc: 'dev' <dev@dpdk.org>; yasu1976@gmail.com; users@dpdk.org
Subject: Re: Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07

Hi Ernesto,

As an additional observation, I tested the setup using iperf3 and was able to achieve throughput of approximately 92~95 Gbps. However, when running the DPDK-Testpmd application, the throughput does not reach similar values.

Thanks and regards,
Ayshathul Thuhara

---

From: Ayshathul Thuhara <ayshathul.thuhara@iwave-global.com>
Sent: 13 February 2026 14:24
To: Ernesto Ruffini <eruffini@outsys.org>
Cc: 'dev' <dev@dpdk.org>; yasu1976@gmail.com <yasu1976@gmail.com>; users@dpdk.org <users@dpdk.org>
Subject: Re: Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07

Hi Ernesto, 

Thankyou for the suggestion.

I will look into "https://fast.dpdk.org/doc/perf/DPDK_23_11_NVIDIA_NIC_performance_report.pdf" , but here the tests uses external device for traffic generator.

Yes, with ethtool it shows 400Gbps.

The module can support upto 100Gbps. But it should have increased more than 10Gbps. I will disable AN and check once.

Thanks and regards, 

Ayshathul Thuhara

---

From: Ernesto Ruffini <eruffini@outsys.org>
Sent: 13 February 2026 14:19
To: Ayshathul Thuhara <ayshathul.thuhara@iwave-global.com>; users@dpdk.org <users@dpdk.org>
Cc: 'dev' <dev@dpdk.org>; yasu1976@gmail.com <yasu1976@gmail.com>
Subject: RE: Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07

Hi Ayshathul,

I think the best is to follow https://fast.dpdk.org/doc/perf/DPDK_23_11_NVIDIA_NIC_performance_report.pdf

Did you check with ethtool or similar the actual connection speed? ethtool linux-nic-name | grep Speed

Maybe your module limits it to 10Gbps. In case try to disable auto-negotiation

Regards,

               Ernesto

From: Ayshathul Thuhara <ayshathul.thuhara@iwave-global.com>
Sent: Friday, February 13, 2026 07:36
To: users@dpdk.org
Cc: dev <dev@dpdk.org>; yasu1976@gmail.com
Subject: Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07

Dear Team,

I hope this message finds you well.

I am currently performing testing on ConnectX-7 with 1x400G hardware using DPDK v23.07. However, I am unable to achieve data transfer rates beyond 10 Gbps. While reviewing the DPDK mailing list, I came across your previous responses in the related discussion (https://mails.dpdk.org/archives/users/2024-July/007767.html), where you mentioned achieving throughput of around 250 Gbps and above.

Could you kindly advise on the configuration changes or optimizations required to improve throughput in this setup?

For reference, I am using an OSFP loopback module for testing, where the same port is used for both transmission and reception (single-port loopback setup).

CX-7 Firmware: 28.45.1200

CPU : Intel(R) Core(TM) i7-14700

Command used : sudo ./build/app/dpdk-testpmd -a 01:00.0 -- -i

I would greatly appreciate your guidance.

Thank you in advance, and I look forward to your response.

Thanks and regards,
Ayshathul Thuhara