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<p class="MsoNormal"><a name="_____replyseparator"></a><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"> libvir-list-bounces@redhat.com [mailto:libvir-list-bounces@redhat.com]
<b>On Behalf Of </b>Adnan Mundres<br>
<b>Sent:</b> Wednesday, January 24, 2018 6:54 PM<br>
<b>To:</b> libvir-list@redhat.com<br>
<b>Subject:</b> [libvirt] with vhostuser I cannot use hugepages<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">In my setup I am using qemu-kvm without openstack. I am trying to use ovs with dpdk. In my xml file I added following lines for the dpdkvhostuser<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"><cpu mode='host-passthrough'><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"> <numa><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"> <cell id="0" cpus="0-6" memory="16777216" unit='KiB' memAccess="shared"/><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"> </numa><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"> </cpu><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">[Mooney, Sean K] this xml snippit is not requsting the use of huge page memory.<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">It is requesting memory to be allocated form a single numa node and for that to be mmaped shared.<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Dpdk does not actually need the guest to use hugepages it just improves the performance. What it requires<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Is that the gues uses file descriptor backed, pre allocated, locked, shared memory.<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">e.g.<o:p></o:p></span></i></b></p>
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<p class="MsoNormal" style="margin-left:4.75pt;background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> <locked/><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:4.75pt;background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> <source type='file'/><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:4.75pt;background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> <access mode='shared'/><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:4.75pt;background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> <allocation mode='immediate'/><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </memoryBacking><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hugepages will enable all of the above features implicitly.
<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">to enable hugepages add<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><memoryBacking><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:5.25pt;background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><hugepages><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:5.25pt;background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> <page size="16" unit="G" nodeset="0"/><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </hugepages><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="background:white"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"></memoryBacking><o:p></o:p></span></i></b></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">I have enabled hugepages during boot time<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">ot@mvmgptb11hyp01 hyp-1]# cat /proc/meminfo | grep -i huge<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">AnonHugePages: 126976 kB<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">HugePages_Total: 100<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">HugePages_Free: 80<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">HugePages_Rsvd: 0<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">HugePages_Surp: 0<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">Hugepagesize: 1048576 kB<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">But When I start my vm (virsh start vm1.xml) I am seeing that this vm is not using memory from hugepages, rather it is taking memory from total
memory. When I checked the log file I see that it is using<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">-object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/var/lib/libvirt/qemu/ram,share=yes<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">It should use backend memory as following<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">-object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu/vm1,share=yes<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica Neue";color:black">Any idea how can I use memory from hugepages<o:p></o:p></span></p>
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