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<p class="MsoNormal"><span style="color:#1F497D">If you want to use 1G huge pages, you need to provision 1G huge pages in sysinv for the compute and then specify the page size extra spec when launching the VM.<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">system host-memory-modify<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">usage: system host-memory-modify [-m <Platform Reserved MiB>]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> [-2M <2M hugepages number>]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> [-1G <1G hugepages number>]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <hostname or id> <processor><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">You will have to reduce the number of 2M huge pages to accommodate the 1G requirements.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">You should not be manually modifying grub args.
<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">Brent <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Perez, Ricardo O [mailto:ricardo.o.perez@intel.com]
<br>
<b>Sent:</b> Friday, October 19, 2018 1:45 PM<br>
<b>To:</b> starlingx-discuss@lists.starlingx.io<br>
<b>Subject:</b> [Starlingx-discuss] Question - Using 1Gb mem pages<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m trying to execute a test, which his goal is to made use of huge pages (2M / 1G) launching a VM.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have already verified the configuration of the controllers GRUB options and we have defined the variable hugepagesz=1G, however, inside the same parameters list, there is a “default_hugepagesz=2M”. The default hugepagesz, has been modified
to 1G, and the compute has been restarted with no issues.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The flavor has been modified, with the following option: “ hw:mem_page_size=104875” (1G) page.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However when I launch a VM using the modified flavor it creates the VM, but if I check the field values of the VM using “ openstack server show <vm_name>”. I’m getting the following value for pgsize:
<o:p></o:p></p>
<p class="MsoNormal">wrs-res:topology | node:0, 512MB, pgsize:2M, vcpus:0, pol:sha |<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, seems like it’s still taking the 2M pagesize instead of the 1G.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What I have already tried is to:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Change also the image metadata: hw:mem_page_size=large and also 104875. Result, VM launched successfully, but pgsize value still 2M.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Leave the GRUB default values, and use modified flavor to hw:mem_page_size=104875, launch the VM with ERROR status.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Leave the GRUB default values, and use modified flavor to hw:mem_page_size=2048, launch the VM with success, , pgsize value is 2M, which is expected, ok.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Leave the GRUB default values, and use modified flavor to hw:mem_page_size=small launch the VM with success, , pgsize value is 4k, which is expected, ok.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Leave the GRUB default values, and use modified flavor to hw:mem_page_size=any launch the VM with success, , pgsize value is 2M, which is expected, ok.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Could be this an issue trying to use 1G mem pages or do I’m missing some other configuration parameter?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance for your help<o:p></o:p></p>
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