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<body><p style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">Dear </strong><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;text-size-adjust:none;color:#000000;font-size:11pt;orphans:2;background-color:#ffffff;font-weight:bold;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">DPDK Team</span><strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">,</strong></p>
<p style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;">I hope this email finds you well. </p>
<p style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;">I'm writing to inquire about DPDK's future plans regarding dynamic CPU initialization support, particularly in Kubernetes environments where exclusive CPU Pod scaling is being enhanced.</p>
<p style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">Backgroud:</strong><br style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">With Kubernetes upcoming improvements to InPlacePodVerticalScaling for exclusive CPU Pods (Guaranteed QoS Pods), we have encountered a limitation when using DPDK:</p>
<ul style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;list-style:disc;display:block;orphans:2;margin-left:25px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><li style="box-sizing:content-box;text-size-adjust:none;font-size:11.25pt;vertical-align:top;display:list-item;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;">A Pod initialized with <strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">5 exclusive CPUs</strong> can have DPDK’s EAL successfully bind and utilize these cores.</li>
<li style="box-sizing:content-box;text-size-adjust:none;font-size:11.25pt;vertical-align:top;display:list-item;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:4px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;">However, when the Pod scales up (e.g., adding <strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">2 new CPUs</strong>), DPDK currently lacks native mechanisms to detect and initialize the newly allocated cores. This forces us to either restart the Pod (causing service disruption) or leave additional CPUs underutilized.</li>
</ul><p style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">Key Questions:</strong></p>
<ol style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;list-style:decimal;display:block;orphans:2;margin-left:25px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><li style="box-sizing:content-box;text-size-adjust:none;font-size:11.25pt;vertical-align:top;display:list-item;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;">Is there an active DPDK roadmap item to support <span style="font-weight: bold;">binded and </span><span style="color:#373a40;font-family:Arial, sans-serif;font-size:11.25pt;orphans:2;text-align:left;background-color:#ffffff;"><span style="font-weight: bold;">initialized</span> </span><strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">CPUs scaling up and down</strong>?</li>
<li style="box-sizing:content-box;text-size-adjust:none;font-size:11.25pt;vertical-align:top;display:list-item;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:4px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;">If not, would the DPDK community consider contributions in this area, especially given Kubernetes’ evolving CPU management capabilities?</li>
</ol><p style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;">We believe such functionality would significantly benefit cloud-native NFV workloads. Any guidance or references to ongoing work would be greatly appreciated.</p>
<p style="box-sizing:content-box;font-family:Arial, sans-serif;text-size-adjust:none;color:#000000;font-size:10pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:5px;margin-right:0px;margin-top:5px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><span style="box-sizing:content-box;font-family:Arial, sans-serif;text-size-adjust:none;font-size:11pt;font-weight:bold;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">Reference Link:</span></p>
<p style="box-sizing:content-box;font-family:Arial, sans-serif;text-size-adjust:none;color:#000000;font-size:10pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:5px;margin-right:0px;margin-top:5px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><span style="box-sizing:content-box;text-size-adjust:none;font-size:11pt;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;orphans:2;background-color:#ffffff;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"> InPlacePodVerticalScaling</span><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;orphans:2;background-color:#ffffff;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"> Enhancements for </span></span><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';text-size-adjust:none;color:#1f2328;font-size:12pt;orphans:2;text-align:left;background-color:#ffffff;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">guaranteed pods</span><span style="box-sizing:content-box;text-size-adjust:none;font-size:11pt;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;orphans:2;background-color:#ffffff;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">: </span></span><a href="https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/1287-in-place-update-pod-resources/README.md#future-enhancements" target="_blank" title="" style="box-sizing:content-box;text-size-adjust:none;color:#2a82f0;text-decoration:underline;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"><span style="box-sizing:content-box;text-size-adjust:none;font-size:11pt;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;orphans:2;background-color:#ffffff;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/1287-in-place-update-pod-resources/README.md#future-enhancements</span></span></a></p>
<p style="box-sizing:content-box;font-family:Arial, sans-serif;text-size-adjust:none;color:#000000;font-size:10pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:5px;margin-right:0px;margin-top:5px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><span style="box-sizing:content-box;text-size-adjust:none;font-size:11pt;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;orphans:2;background-color:#ffffff;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"> A PR to implement </span></span><span style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';text-size-adjust:none;color:#1f2328;font-size:12pt;orphans:2;text-align:left;background-color:#ffffff;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">guaranteed pods resize: https://github.com/kubernetes/kubernetes/pull/129719</span></p>
<p style="box-sizing:content-box;font-family:Arial, sans-serif;text-size-adjust:none;color:#000000;font-size:10pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:5px;margin-right:0px;margin-top:5px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><span style="box-sizing:content-box;text-size-adjust:none;font-size:11pt;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;"><span style="box-sizing: content-box; font-family: Arial, sans-serif; text-size-adjust: none; margin: 0px; padding: 0px;"><span style="color: rgb(55, 58, 64); font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei", sans-serif; font-size: 11.25pt; orphans: 2; background-color: rgb(255, 255, 255);">Thank you for your time and expertise. Looking forward to your insights.</span></span></span></p>
<p style="box-sizing:content-box;font-family:-apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;text-size-adjust:none;color:#373a40;font-size:11.25pt;vertical-align:top;display:block;orphans:2;margin-left:0px;margin-bottom:16px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;background-color:#ffffff;background-image:none;background-position:0% 0%;background-repeat:repeat;background-attachment:scroll;"><strong style="box-sizing:content-box;text-size-adjust:none;margin-left:0px;margin-bottom:0px;margin-right:0px;margin-top:0px;padding-left:0px;padding-bottom:0px;padding-right:0px;padding-top:0px;">Best regards</strong></p>
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