<div dir="ltr"><div>Hi Rashi,</div><div> </div><div>Please change the argument to rte_eal_init (), in your code, -c 0x2 will always bind it to 1st core . Change it to "-c", "0x30" for pinning core 4 and 5.</div><div> </div><div><pre class="gmail-aLF-aPX-K0-aPE" style="font-family:"Courier New",Courier,monospace,arial,sans-serif;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-size:14px">int dpdk_argc = 8; char *dpdk_argv[] = { procName, "-c", "0x2", "--no-huge", filePrefix ,"-m","64" , "--log-level=eal,8"};</pre></div><div> </div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr">Thanks, -Rajesh </div></div></div></div></div> </div> <div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Feb 26, 2025 at 10:25 AM Rashi Agarwal <<a href="mailto:Rashi.Agarwal@mobileum.com">Rashi.Agarwal@mobileum.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-27402858988659225"> <div lang="EN-IN" style="overflow-wrap: break-word;"> <div class="m_-27402858988659225WordSection1"> Hi DPDK Community, I am facing an issue where CPU affinity is not working as expected in RHEL8 with DPDK 20.05, while it works fine in RHEL7. Problem Statement: · When running my program with numactl -C4,5 ./testRTE on RHEL7, the worker threads correctly bind to the assigned cores. · However, on RHEL8, the worker threads always bind to core 1, ignoring the specified CPU set. Environment Details: <ul type="disc"> <li class="MsoNormal"> DPDK Version: 20.05.0</li><li class="MsoNormal"> OS: RHEL8 (Issue) | RHEL7 (Works Fine)</li><li class="MsoNormal"> CPU Affinity Tool: numactl -C</li></ul> Sample Program: Attached Observations: <ul type="disc"> <li class="MsoNormal"> In RHEL7, worker threads correctly bind to cores specified using numactl -C.</li><li class="MsoNormal"> In RHEL8, the threads always bind to core 1, ignoring the CPU set.</li><li class="MsoNormal"> Could DPDK be overriding the CPU affinity in RHEL8?</li></ul> Questions: <ol start="1" type="1"> <li class="MsoNormal"> Is there any known change in CPU affinity handling between RHEL7 and RHEL8 affecting DPDK?</li><li class="MsoNormal"> Does DPDK override thread affinity when rte_eal_init() is called?</li><li class="MsoNormal"> Is there any workaround or EAL flag to ensure that CPU affinity is respected?</li></ol> Any insights or suggestions would be greatly appreciated. Thanks, Rashi Agarwal. </div> </div> </div></blockquote></div>