Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07

[Ernesto Ruffini]

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 at iwave-global.com> 
Sent: Friday, February 13, 2026 10:04
To: Ernesto Ruffini <eruffini at outsys.org>
Cc: 'dev' <dev at dpdk.org>; yasu1976 at gmail.com; users at 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 at iwave-global.com
<mailto:ayshathul.thuhara at iwave-global.com> >
Sent: 13 February 2026 14:24
To: Ernesto Ruffini <eruffini at outsys.org <mailto:eruffini at outsys.org> >
Cc: 'dev' <dev at dpdk.org <mailto:dev at dpdk.org> >; yasu1976 at gmail.com
<mailto:yasu1976 at gmail.com>  <yasu1976 at gmail.com <mailto:yasu1976 at gmail.com>
>; users at dpdk.org <mailto:users at dpdk.org>  <users at dpdk.org
<mailto:users at 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 at outsys.org <mailto:eruffini at outsys.org> >
Sent: 13 February 2026 14:19
To: Ayshathul Thuhara <ayshathul.thuhara at iwave-global.com
<mailto:ayshathul.thuhara at iwave-global.com> >; users at dpdk.org
<mailto:users at dpdk.org>  <users at dpdk.org <mailto:users at dpdk.org> >
Cc: 'dev' <dev at dpdk.org <mailto:dev at dpdk.org> >; yasu1976 at gmail.com
<mailto:yasu1976 at gmail.com>  <yasu1976 at gmail.com <mailto:yasu1976 at 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 at iwave-global.com
<mailto:ayshathul.thuhara at iwave-global.com> > 
Sent: Friday, February 13, 2026 07:36
To: users at dpdk.org <mailto:users at dpdk.org> 
Cc: dev <dev at dpdk.org <mailto:dev at dpdk.org> >; yasu1976 at gmail.com
<mailto:yasu1976 at 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

 

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