<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <article class="text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&:has([data-writing-block])>*]:pointer-events-auto scroll-mt-(--header-height)" tabindex="-1" dir="auto" data-turn-id="c60e2f95-9833-4b11-91df-92a348916f45" data-testid="conversation-turn-67" data-scroll-anchor="false" data-turn="user"></article><article class="text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&:has([data-writing-block])>*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]" tabindex="-1" dir="auto" data-turn-id="748d4d8c-022e-4b14-8873-ab0f35445357" data-testid="conversation-turn-68" data-scroll-anchor="true" data-turn="assistant"> <div class="elementToProof" style="direction: ltr; margin-top: 1em; margin-bottom: 1em; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <span class="elementToProof">Hi Ernesto,</span></div> <div class="elementToProof" style="direction: ltr; margin-top: 1em; margin-bottom: 1em; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <span class="elementToProof">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.</span></div> <div class="elementToProof" style="direction: ltr; margin-top: 1em; margin-bottom: 1em; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <span class="elementToProof">Thanks and regards,</span><br> <span class="elementToProof">Ayshathul Thuhara</span></div> </article> <div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof"> <br> </div> <div id="appendonsend"></div> <hr style="display:inline-block;width:98%" tabindex="-1"> <div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Ayshathul Thuhara <ayshathul.thuhara@iwave-global.com><br> <b>Sent:</b> 13 February 2026 14:24<br> <b>To:</b> Ernesto Ruffini <eruffini@outsys.org><br> <b>Cc:</b> 'dev' <dev@dpdk.org>; yasu1976@gmail.com <yasu1976@gmail.com>; users@dpdk.org <users@dpdk.org><br> <b>Subject:</b> Re: Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07</font> <div> </div> </div> <style type="text/css" style="display:none">  </style> <div dir="ltr"> <div class="x_elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Hi Ernesto, </div> <div class="x_elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div class="x_elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Thankyou for the suggestion.</div> <div class="x_elementToProof" style="color:rgb(0,0,0)"><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">I will look into "</span><span class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt"><a data-auth="NotApplicable" data-linkindex="0" rel="noopener noreferrer" title="https://fast.dpdk.org/doc/perf/DPDK_23_11_NVIDIA_NIC_performance_report.pdf" class="x_OWAAutoLink" id="OWAeff86e8d-ad77-3696-fe19-ea870b99fa63" target="_blank" href="https://fast.dpdk.org/doc/perf/DPDK_23_11_NVIDIA_NIC_performance_report.pdf">https://fast.dpdk.org/doc/perf/DPDK_23_11_NVIDIA_NIC_performance_report.pdf</a>" , but here the tests uses external device for traffic generator.</span></div> <div class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"> <br> </div> <div class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"> <span class="x_elementToProof">Yes, with ethtool it shows 400Gbps.</span></div> <div class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"> <span class="x_elementToProof">The module can support upto 100Gbps. But it should have increased more than 10Gbps. I will disable AN and check once.</span></div> <div class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"> <br> </div> <div class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"> Thanks and regards, </div> <div class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"> Ayshathul Thuhara</div> <div class="x_elementToProof" style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"> <br> </div> <div id="x_appendonsend"></div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ernesto Ruffini <eruffini@outsys.org><br> <b>Sent:</b> 13 February 2026 14:19<br> <b>To:</b> Ayshathul Thuhara <ayshathul.thuhara@iwave-global.com>; users@dpdk.org <users@dpdk.org><br> <b>Cc:</b> 'dev' <dev@dpdk.org>; yasu1976@gmail.com <yasu1976@gmail.com><br> <b>Subject:</b> RE: Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07</font> <div> </div> </div> <style>  </style> <div lang="EN-US" style="word-wrap:break-word"> <div class="x_x_WordSection1"> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Hi </span><span style="color:black">Ayshathul</span><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">,</span></p> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">I think the best is to follow <a href="https://fast.dpdk.org/doc/perf/DPDK_23_11_NVIDIA_NIC_performance_report.pdf"> https://fast.dpdk.org/doc/perf/DPDK_23_11_NVIDIA_NIC_performance_report.pdf</a></span></p> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Did you check with ethtool or similar the actual connection speed? ethtool linux-nic-name | grep Speed</span></p> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Maybe your module limits it to 10Gbps. In case try to disable auto-negotiation</span></p> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> </span></p> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Regards,</span></p> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Ernesto</span></p> <p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> </span></p> <div> <div style="border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0cm 0cm 0cm"> <p class="x_x_MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Ayshathul Thuhara <ayshathul.thuhara@iwave-global.com> <br> <b>Sent:</b> Friday, February 13, 2026 07:36<br> <b>To:</b> users@dpdk.org<br> <b>Cc:</b> dev <dev@dpdk.org>; yasu1976@gmail.com<br> <b>Subject:</b> Guidance Required to Improve Throughput on ConnectX-7 (1x400G) with DPDK v23.07</span></p> </div> </div> <p class="x_x_MsoNormal"> </p> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">Dear Team,</span></p> </div> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">I hope this message finds you well.</span></p> </div> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">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 (<a href="https://mails.dpdk.org/archives/users/2024-July/007767.html" target="_new" id="OWAe131b2f8-ca05-2ff3-d67e-40e6b9de2cd3">https://mails.dpdk.org/archives/users/2024-July/007767.html</a>), where you mentioned achieving throughput of around 250 Gbps and above.</span></p> </div> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">Could you kindly advise on the configuration changes or optimizations required to improve throughput in this setup?</span></p> </div> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">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).</span></p> </div> <div> <p class="x_x_MsoNormal"><b><span style="color:black">CX-7 Firmware: 28.45.1200</span></b><span style="color:black"></span></p> </div> <div> <p class="x_x_MsoNormal"><b><span style="color:black">CPU : Intel(R) Core(TM) i7-14700</span></b><span style="color:black"></span></p> </div> <div> <p class="x_x_MsoNormal"><b><span style="color:black">Command used : sudo ./build/app/dpdk-testpmd -a 01:00.0 -- -i</span></b><span style="color:black"></span></p> </div> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">I would greatly appreciate your guidance.</span></p> </div> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">Thank you in advance, and I look forward to your response.</span></p> </div> <div style="margin-top:12.0pt; margin-bottom:12.0pt"> <p class="x_x_MsoNormal"><span style="color:black">Thanks and regards,<br> Ayshathul Thuhara</span></p> </div> <div> <p class="x_x_MsoNormal"><span style="color:black"> </span></p> </div> </div> </div> </div> </body> </html>