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<p class="MsoNormal"><span style="color:#1F497D">Hi, Marvin:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> This feature is not directly related with “system host-memory-modify” function, user still should be able to modify mem config as before.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> This feature is enable K8S feature-gate as describe in [1]. And K8S enabling hugepage feature is opposite to compute label<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> ( means compute label is tagged, then k8s hugepage feature is disabled (false), if compute label is not tagged , then k8s hugepage is enabled )
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">About your question about VM hugepage decrease, I did not dig into VM mem , so I cannot give more comments. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">[1] <a href="https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/">
https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
<p class="MsoNormal">BR<br>
Austin Sun. <span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b>From:</b> Huang, Marvin [mailto:Marvin.Huang@windriver.com]
<br>
<b>Sent:</b> Thursday, April 25, 2019 4:33 AM<br>
<b>To:</b> Sun, Austin <austin.sun@intel.com><br>
<b>Cc:</b> starlingx-discuss@lists.starlingx.io<br>
<b>Subject:</b> questions about '[Feature] Huge page management' https://storyboard.openstack.org/#!/story/2004763<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Austin,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">According to (Storyboard) <a href="https://storyboard.openstack.org/%23!/story/2004763">
2004763</a>, I know that you’re working on the feature “Huge page management”.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve some questions about the feature.<br>
Though one of its 2 tasks is still in Review (the other is shown merged), you might now have the answers already.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In the description of the Story, there are requirement:<o:p></o:p></p>
<p class="MsoNormal">“- Enable k8s huge page feature for <span style="background:yellow;mso-highlight:yellow">
worker nodes that <b><span style="color:red">do not</span></b><span style="color:red">
</span>have the openstack compute label</span>. It should be disabled otherwise.”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Questions: what is this meaning to users?<o:p></o:p></b></p>
<p class="MsoListParagraph" style="margin-left:.75in">By ‘Enable’, is it meaning users can modify memory allocation on the node? (via the following):<br>
system host-modify <worker-name> [-2M <2M hugepages number>] [-1G <1G hugepages number>] [-f <function>] …<br>
or Horizon: Admin -> Platform -> Host Inventory …<br>
<br>
Otherwise (‘disabled’), the CLIs (system host-memory-xxx) will reject any requests?
<br>
Or the corresponding Horizon pages do not have any items to update the memory application? Or those were disabled?<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in"><o:p> </o:p></p>
<p class="MsoNormal">“- Automatically defaults for <span style="background:yellow;mso-highlight:yellow">
worker nodes <span style="color:red">with </span>openstack compute label</span>. Changes will be applied on the unlock.<o:p></o:p></p>
<p class="MsoNormal"> - Current 2M huge page default settings<o:p></o:p></p>
<p class="MsoNormal"> - 1-1G huge page per numa node for vswitch “<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Questions: in this situation, is the k8s huge page feature disabled (according to the above requirement)?<br>
</b>And the (host-memory) CLIs will reject any requests?<b><o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And a question related with VMs:<o:p></o:p></p>
<p class="MsoNormal">If a VM using huge page (with flavor having ‘hw:mem_page_size=large’ or ‘hw:mem_page_size=1048576’) is launched, will the free memory pages decreased accordingly on the worker it’s running on?<o:p></o:p></p>
<p class="MsoNormal">That is, if the VM is consuming 1G huge-page, the number of free page of 1G size on the hosting worker should be reduced by 1. Is this still the expected behavior?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This is the assumption in <a href="https://bugs.launchpad.net/starlingx/+bug/1813325">
https://bugs.launchpad.net/starlingx/+bug/1813325</a>.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Marvin<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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