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Ah I see the error You have <memoryBacking> <hugepages/> <page size='1' unit='G' nodeset='0'/> </memoryBacking> Not <memoryBacking> <hugepages> <page size='1' unit='G' nodeset='0'/> </hugepages> </memoryBacking> Hi Sean , Thanks for you reply. I do have hugepages configuration in my xml and still it is not getting the memory from Hugepage. Following is my complete
xml file <domain type='kvm'> <uuid>c1f7a3d0-ccb7-4a85-b0f0-dd4bab73ba54</uuid> <description>Timos VM</description> <memory>16777216</memory> <currentMemory>16777216</currentMemory> <cpu mode='host-model'> <numa> <cell id="0" cpus="0" memory="16777216" unit='KiB' memAccess="shared"/> </numa> </cpu> <memoryBacking> <hugepages/> <page size='1' unit='G' nodeset='0'/> </memoryBacking> <numatune> <memory mode='strict' nodeset='1'/> </numatune> <vcpu current='7'>7</vcpu> <cputune> <vcpupin vcpu='0' cpuset='2'/> <vcpupin vcpu='1' cpuset='3'/> <vcpupin vcpu='2' cpuset='4'/> <vcpupin vcpu='3' cpuset='5'/> <vcpupin vcpu='4' cpuset='6'/> <vcpupin vcpu='5' cpuset='7'/> <vcpupin vcpu='6' cpuset='8'/> <emulatorpin cpuset="0,1"/> </cputune> <os> <type arch='x86_64' machine='pc'>hvm</type> <smbios mode='sysinfo'/> </os> <sysinfo type ='smbios' <clock offset='utc'> <timer name='pit' tickpolicy='delay'/> <timer name='rtc' tickpolicy='delay'/> </clock> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/mvmgptb11/images/flexibed/vm_5/sros-vm.qcow2'/> <target dev='hda' bus='virtio'/> </disk> <interface type='bridge'> <mac address='FA:AC:A5:00:7E:00'/> <source bridge='breth0'/> <model type='virtio'/> </interface> <interface type='bridge'> <mac address='FA:AC:A5:00:7E:01'/> <source bridge='breth1'/> <model type='virtio'/> </interface> <interface type='vhostuser'> <mac address='FA:AC:A5:00:7E:02'/> <source type='unix' path='/var/run/openvswitch/vhost-user-1' mode='client'/> <model type='virtio'/> </interface> <interface type='vhostuser'> <mac address='FA:AC:A5:00:7E:04'/> <source type='unix' path='/var/run/openvswitch/vhost-user-3' mode='client'/> <model type='virtio'/> </interface> <interface type='vhostuser'> <mac address='FA:AC:A5:00:7E:05'/> <source type='unix' path='/var/run/openvswitch/vhost-user-2' mode='client'/> <model type='virtio'/> </interface> <console type='tcp'> <source mode='bind' host='0.0.0.0' service='2501'/> <protocol type='telnet'/> <target type='virtio' port='0'/> </console> <watchdog model='i6300esb' action=''/> </devices> <seclabel type='none'/> </domain> On Wednesday, January 24, 2018 12:54 PM, "Mooney, Sean K" <sean.k.mooney@xxxxxxxxx> wrote: From: Mooney, Sean K
From:
libvir-list-bounces@xxxxxxxxxx [mailto:libvir-list-bounces@xxxxxxxxxx]
On Behalf Of Adnan Mundres 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 <cpu mode='host-passthrough'> <numa> <cell id="0" cpus="0-6" memory="16777216" unit='KiB' memAccess="shared"/> </numa> </cpu> [Mooney, Sean K] this xml snippit is not requsting the use of huge page memory. It is requesting memory to be allocated form a single numa node and for that to be mmaped shared. Dpdk does not actually need the guest to use hugepages it just improves the performance. What it requires Is that the gues uses file descriptor backed, pre allocated, locked, shared memory. e.g. <memoryBacking> <locked/> <source type='file'/> <access mode='shared'/> <allocation mode='immediate'/> </memoryBacking> Hugepages will enable all of the above features implicitly.
to enable hugepages add <memoryBacking> <hugepages> <page size="16" unit="G" nodeset="0"/> </hugepages> </memoryBacking> [Mooney, Sean K] oh I forgot to say you can find the relevant documentation here
https://libvirt.org/formatdomain.html#elementsMemoryBacking I have enabled hugepages during boot time ot@mvmgptb11hyp01 hyp-1]# cat /proc/meminfo | grep -i huge AnonHugePages: 126976 kB HugePages_Total: 100 HugePages_Free: 80 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 1048576 kB 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 -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/var/lib/libvirt/qemu/ram,share=yes It should use backend memory as following -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu/vm1,share=yes Any idea how can I use memory from hugepages |
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