Number of cells seems right, but number of sockets is definitely wrong.
OS: Ubuntu 14.04.2 LTS
Kernel: 3.16.0-38-generic
Most updated versions of all related packages as of May 26, 2015.
root@vm0:/media/scripts/vm# virsh capabilities
<capabilities>
<host>
<uuid>00000000-0000-0000-0000-0cc47a4c5e42</uuid>
<cpu>
<arch>x86_64</arch>
<model>SandyBridge</model>
<vendor>Intel</vendor>
<topology sockets='1' cores='12' threads='2'/>
<feature name='invpcid'/>
<feature name='erms'/>
<feature name='bmi2'/>
<feature name='smep'/>
<feature name='avx2'/>
<feature name='bmi1'/>
<feature name='fsgsbase'/>
<feature name='abm'/>
<feature name='pdpe1gb'/>
<feature name='rdrand'/>
<feature name='f16c'/>
<feature name='osxsave'/>
<feature name='movbe'/>
<feature name='dca'/>
<feature name='pcid'/>
<feature name='pdcm'/>
<feature name='xtpr'/>
<feature name='fma'/>
<feature name='tm2'/>
<feature name='est'/>
<feature name='smx'/>
<feature name='vmx'/>
<feature name='ds_cpl'/>
<feature name='monitor'/>
<feature name='dtes64'/>
<feature name='pbe'/>
<feature name='tm'/>
<feature name='ht'/>
<feature name='ss'/>
<feature name='acpi'/>
<feature name='ds'/>
<feature name='vme'/>
</cpu>
<power_management>
<suspend_disk/>
<suspend_hybrid/>
</power_management>
<migration_features>
<live/>
<uri_transports>
<uri_transport>tcp</uri_transport>
</uri_transports>
</migration_features>
<topology>
<cells num='2'>
<cell id='0'>
<memory unit='KiB'>131928440</memory>
<cpus num='24'>
<cpu id='0' socket_id='0' core_id='0' siblings='0,24'/>
<cpu id='1' socket_id='0' core_id='1' siblings='1,25'/>
<cpu id='2' socket_id='0' core_id='2' siblings='2,26'/>
<cpu id='3' socket_id='0' core_id='3' siblings='3,27'/>
<cpu id='4' socket_id='0' core_id='4' siblings='4,28'/>
<cpu id='5' socket_id='0' core_id='5' siblings='5,29'/>
<cpu id='6' socket_id='0' core_id='8' siblings='6,30'/>
<cpu id='7' socket_id='0' core_id='9' siblings='7,31'/>
<cpu id='8' socket_id='0' core_id='10' siblings='8,32'/>
<cpu id='9' socket_id='0' core_id='11' siblings='9,33'/>
<cpu id='10' socket_id='0' core_id='12' siblings='10,34'/>
<cpu id='11' socket_id='0' core_id='13' siblings='11,35'/>
<cpu id='24' socket_id='0' core_id='0' siblings='0,24'/>
<cpu id='25' socket_id='0' core_id='1' siblings='1,25'/>
<cpu id='26' socket_id='0' core_id='2' siblings='2,26'/>
<cpu id='27' socket_id='0' core_id='3' siblings='3,27'/>
<cpu id='28' socket_id='0' core_id='4' siblings='4,28'/>
<cpu id='29' socket_id='0' core_id='5' siblings='5,29'/>
<cpu id='30' socket_id='0' core_id='8' siblings='6,30'/>
<cpu id='31' socket_id='0' core_id='9' siblings='7,31'/>
<cpu id='32' socket_id='0' core_id='10' siblings='8,32'/>
<cpu id='33' socket_id='0' core_id='11' siblings='9,33'/>
<cpu id='34' socket_id='0' core_id='12' siblings='10,34'/>
<cpu id='35' socket_id='0' core_id='13' siblings='11,35'/>
</cpus>
</cell>
<cell id='1'>
<memory unit='KiB'>132117356</memory>
<cpus num='24'>
<cpu id='12' socket_id='1' core_id='0' siblings='12,36'/>
<cpu id='13' socket_id='1' core_id='1' siblings='13,37'/>
<cpu id='14' socket_id='1' core_id='2' siblings='14,38'/>
<cpu id='15' socket_id='1' core_id='3' siblings='15,39'/>
<cpu id='16' socket_id='1' core_id='4' siblings='16,40'/>
<cpu id='17' socket_id='1' core_id='5' siblings='17,41'/>
<cpu id='18' socket_id='1' core_id='8' siblings='18,42'/>
<cpu id='19' socket_id='1' core_id='9' siblings='19,43'/>
<cpu id='20' socket_id='1' core_id='10' siblings='20,44'/>
<cpu id='21' socket_id='1' core_id='11' siblings='21,45'/>
<cpu id='22' socket_id='1' core_id='12' siblings='22,46'/>
<cpu id='23' socket_id='1' core_id='13' siblings='23,47'/>
<cpu id='36' socket_id='1' core_id='0' siblings='12,36'/>
<cpu id='37' socket_id='1' core_id='1' siblings='13,37'/>
<cpu id='38' socket_id='1' core_id='2' siblings='14,38'/>
<cpu id='39' socket_id='1' core_id='3' siblings='15,39'/>
<cpu id='40' socket_id='1' core_id='4' siblings='16,40'/>
<cpu id='41' socket_id='1' core_id='5' siblings='17,41'/>
<cpu id='42' socket_id='1' core_id='8' siblings='18,42'/>
<cpu id='43' socket_id='1' core_id='9' siblings='19,43'/>
<cpu id='44' socket_id='1' core_id='10' siblings='20,44'/>
<cpu id='45' socket_id='1' core_id='11' siblings='21,45'/>
<cpu id='46' socket_id='1' core_id='12' siblings='22,46'/>
<cpu id='47' socket_id='1' core_id='13' siblings='23,47'/>
</cpus>
</cell>
</cells>
</topology>
<secmodel>
<model>apparmor</model>
<doi>0</doi>
</secmodel>
<secmodel>
<model>dac</model>
<doi>0</doi>
<baselabel type='kvm'>+106:+106</baselabel>
<baselabel type='qemu'>+106:+106</baselabel>
</secmodel>
</host>
<guest>
<os_type>hvm</os_type>
<arch name='i686'>
<wordsize>32</wordsize>
<emulator>/usr/bin/qemu-system-i386</emulator>
<machine canonical='pc-i440fx-trusty' maxCpus='255'>pc</machine>
<machine maxCpus='255'>pc-0.12</machine>
<machine maxCpus='255'>pc-1.3</machine>
<machine maxCpus='255'>pc-q35-1.6</machine>
<machine canonical='pc-1.0-qemu-kvm'
maxCpus='255'>pc-1.0-precise</machine>
<machine maxCpus='255'>pc-q35-1.5</machine>
<machine maxCpus='1'>xenpv</machine>
<machine maxCpus='255'>pc-i440fx-1.6</machine>
<machine maxCpus='255'>pc-i440fx-1.7</machine>
<machine maxCpus='255'>pc-0.11</machine>
<machine maxCpus='255'>pc-0.10</machine>
<machine maxCpus='255'>pc-1.2</machine>
<machine maxCpus='1'>isapc</machine>
<machine maxCpus='255'>pc-q35-1.4</machine>
<machine maxCpus='128'>xenfv</machine>
<machine maxCpus='255'>pc-0.15</machine>
<machine maxCpus='255'>pc-0.14</machine>
<machine maxCpus='255'>pc-i440fx-1.5</machine>
<machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>
<machine maxCpus='255'>pc-i440fx-1.4</machine>
<machine maxCpus='255'>pc-1.1</machine>
<machine maxCpus='255'>pc-q35-1.7</machine>
<machine canonical='pc-1.0' maxCpus='255'>pc-1.0-qemu-kvm</machine>
<machine maxCpus='255'>pc-i440fx-2.0</machine>
<machine maxCpus='255'>pc-0.13</machine>
<domain type='qemu'>
</domain>
<domain type='kvm'>
<emulator>/usr/bin/kvm-spice</emulator>
<machine canonical='pc-i440fx-trusty' maxCpus='255'>pc</machine>
<machine maxCpus='255'>pc-1.3</machine>
<machine maxCpus='255'>pc-0.12</machine>
<machine maxCpus='255'>pc-q35-1.6</machine>
<machine canonical='pc-1.0-qemu-kvm'
maxCpus='255'>pc-1.0-precise</machine>
<machine maxCpus='255'>pc-q35-1.5</machine>
<machine maxCpus='1'>xenpv</machine>
<machine maxCpus='255'>pc-i440fx-1.6</machine>
<machine maxCpus='255'>pc-i440fx-1.7</machine>
<machine maxCpus='255'>pc-0.11</machine>
<machine maxCpus='255'>pc-1.2</machine>
<machine maxCpus='255'>pc-0.10</machine>
<machine maxCpus='1'>isapc</machine>
<machine maxCpus='255'>pc-q35-1.4</machine>
<machine maxCpus='128'>xenfv</machine>
<machine maxCpus='255'>pc-0.15</machine>
<machine maxCpus='255'>pc-0.14</machine>
<machine maxCpus='255'>pc-i440fx-1.5</machine>
<machine maxCpus='255'>pc-i440fx-1.4</machine>
<machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>
<machine maxCpus='255'>pc-1.1</machine>
<machine maxCpus='255'>pc-q35-1.7</machine>
<machine canonical='pc-1.0' maxCpus='255'>pc-1.0-qemu-kvm</machine>
<machine maxCpus='255'>pc-i440fx-2.0</machine>
<machine maxCpus='255'>pc-0.13</machine>
</domain>
</arch>
<features>
<cpuselection/>
<deviceboot/>
<acpi default='on' toggle='yes'/>
<apic default='on' toggle='no'/>
<pae/>
<nonpae/>
</features>
</guest>
<guest>
<os_type>hvm</os_type>
<arch name='x86_64'>
<wordsize>64</wordsize>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<machine canonical='pc-i440fx-trusty' maxCpus='255'>pc</machine>
<machine maxCpus='255'>pc-1.3</machine>
<machine maxCpus='255'>pc-0.12</machine>
<machine maxCpus='255'>pc-q35-1.6</machine>
<machine canonical='pc-1.0-qemu-kvm'
maxCpus='255'>pc-1.0-precise</machine>
<machine maxCpus='255'>pc-q35-1.5</machine>
<machine maxCpus='1'>xenpv</machine>
<machine maxCpus='255'>pc-i440fx-1.6</machine>
<machine maxCpus='255'>pc-i440fx-1.7</machine>
<machine maxCpus='255'>pc-0.11</machine>
<machine maxCpus='255'>pc-1.2</machine>
<machine maxCpus='255'>pc-0.10</machine>
<machine maxCpus='1'>isapc</machine>
<machine maxCpus='255'>pc-q35-1.4</machine>
<machine maxCpus='128'>xenfv</machine>
<machine maxCpus='255'>pc-0.15</machine>
<machine maxCpus='255'>pc-0.14</machine>
<machine maxCpus='255'>pc-i440fx-1.5</machine>
<machine maxCpus='255'>pc-i440fx-1.4</machine>
<machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>
<machine maxCpus='255'>pc-1.1</machine>
<machine maxCpus='255'>pc-q35-1.7</machine>
<machine canonical='pc-1.0' maxCpus='255'>pc-1.0-qemu-kvm</machine>
<machine maxCpus='255'>pc-i440fx-2.0</machine>
<machine maxCpus='255'>pc-0.13</machine>
<domain type='qemu'>
</domain>
<domain type='kvm'>
<emulator>/usr/bin/kvm-spice</emulator>
<machine canonical='pc-i440fx-trusty' maxCpus='255'>pc</machine>
<machine maxCpus='255'>pc-1.3</machine>
<machine maxCpus='255'>pc-0.12</machine>
<machine maxCpus='255'>pc-q35-1.6</machine>
<machine canonical='pc-1.0-qemu-kvm'
maxCpus='255'>pc-1.0-precise</machine>
<machine maxCpus='255'>pc-q35-1.5</machine>
<machine maxCpus='1'>xenpv</machine>
<machine maxCpus='255'>pc-i440fx-1.6</machine>
<machine maxCpus='255'>pc-i440fx-1.7</machine>
<machine maxCpus='255'>pc-0.11</machine>
<machine maxCpus='255'>pc-1.2</machine>
<machine maxCpus='255'>pc-0.10</machine>
<machine maxCpus='1'>isapc</machine>
<machine maxCpus='255'>pc-q35-1.4</machine>
<machine maxCpus='128'>xenfv</machine>
<machine maxCpus='255'>pc-0.15</machine>
<machine maxCpus='255'>pc-0.14</machine>
<machine maxCpus='255'>pc-i440fx-1.5</machine>
<machine maxCpus='255'>pc-i440fx-1.4</machine>
<machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>
<machine maxCpus='255'>pc-1.1</machine>
<machine maxCpus='255'>pc-q35-1.7</machine>
<machine canonical='pc-1.0' maxCpus='255'>pc-1.0-qemu-kvm</machine>
<machine maxCpus='255'>pc-i440fx-2.0</machine>
<machine maxCpus='255'>pc-0.13</machine>
</domain>
</arch>
<features>
<cpuselection/>
<deviceboot/>
<acpi default='on' toggle='yes'/>
<apic default='on' toggle='no'/>
</features>
</guest>
</capabilities>
root@vm0:/media/scripts/vm# virsh nodeinfo
CPU model: x86_64
CPU(s): 48
CPU frequency: 1590 MHz
CPU socket(s): 1
Core(s) per socket: 12
Thread(s) per core: 2
NUMA cell(s): 2
Memory size: 264045796 KiB
root@vm0:/media/scripts/vm# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 24 25 26 27 28 29 30 31 32 33 34 35
node 0 size: 128836 MB
node 0 free: 127447 MB
node 1 cpus: 12 13 14 15 16 17 18 19 20 21 22 23 36 37 38 39 40 41 42 43 44 45
46 47
node 1 size: 129020 MB
node 1 free: 127764 MB
node distances:
node 0 1
0: 10 21
1: 21 10
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https://bugs.launchpad.net/bugs/1446177
Title:
Nodeinfo returns wrong NUMA topology / bad virtualization performance
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1446177/+subscriptions
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