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='reset'/> </devices> <seclabel type='none'/></domain>
On Wednesday, January 24, 2018 12:54 PM, "Mooney, Sean K"
<[email protected]> wrote:
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div.yiv3224014168WordSection1 {}#yiv3224014168 From: Mooney, Sean K
Sent: Wednesday, January 24, 2018 8:52 PM
To: Adnan Mundres <[email protected]>; [email protected]
Cc: Mooney, Sean K <[email protected]>
Subject: RE: [libvirt] with vhostuser I cannot use hugepages
From:[email protected] [mailto:[email protected]]On
Behalf Of Adnan Mundres
Sent: Wednesday, January 24, 2018 6:54 PM
To: [email protected]
Subject: [libvirt] with vhostuser I cannot use hugepages 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
herehttps://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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