Re: [libvirt] memory pinning problem

On Wed, Sep 11, 2013 at 10:47:08AM +0200, David Weber wrote: > Am Freitag, 6. September 2013, 12:10:04 schrieb Daniel P. Berrange: > > On Tue, Aug 27, 2013 at 09:09:25AM +0200, David Weber wrote: > > > Hi, > > > > > > we try to use vcpu pinning on a 2 socket server with Intel Xeon E5620 > > > cpus, HT enabled and 2*6*16GiB Ram but experience problems if we try > > > to > > > start a guest on the second socket: > > > error: Failed to start domain test > > > error: internal error: process exited while connecting to monitor: > > > kvm_init_vcpu failed: Cannot allocate memory > > # virsh freecell 0 > 0: 86071624 KiB > > # virsh freecell 1 > 1: 75258628 KiB > > # virsh edit test > <domain type='kvm'> > > <name>test</name> > <uuid>08cdc389-78bf-450c-89f4-b4728edabdbf</uuid> > <memory unit='KiB'>1048576</memory> > <currentMemory unit='KiB'>1048576</currentMemory> > <vcpu placement='static' cpuset='4-7'>1</vcpu> > <numatune> > > <memory mode='strict' nodeset='1'/> > > </numatune> > <os> > > <type arch='x86_64' machine='pc-i440fx-1.5'>hvm</type> > <boot dev='hd'/> > > </os> > <features> > > <acpi/> > <apic/> > <pae/> > > </features> > <clock offset='utc'/> > <on_poweroff>destroy</on_poweroff> > <on_reboot>restart</on_reboot> > <on_crash>restart</on_crash> > <devices> > > <emulator>/usr/bin/qemu-kvm</emulator> > <controller type='usb' index='0'> > > <address type='pci' domain='0x0000' bus='0x00' slot='0x01' > > function='0x2'/> > > </controller> > <controller type='pci' index='0' model='pci-root'/> > <controller type='ide' index='0'> > > <address type='pci' domain='0x0000' bus='0x00' slot='0x01' > > function='0x1'/> > > </controller> > <input type='mouse' bus='ps2'/> > <graphics type='vnc' port='-1' autoport='yes'/> > <video> > > <model type='cirrus' vram='9216' heads='1'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x02' > > function='0x0'/> > > </video> > <memballoon model='virtio'> > > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' > > function='0x0'/> > > </memballoon> > > </devices> > > </domain> > > # virsh start test > > error: Failed to start domain test > error: internal error: process exited while connecting to monitor: > kvm_init_vcpu failed: Cannot allocate memory > > Allocating memory on this node with numactl works fine > # numactl --cpubind=1 --membind=1 -- dd if=/dev/zero of=/dev/null bs=2G > count=1 > 0+1 records in > 0+1 records out > 2147479552 bytes (2.1 GB) copied, 0.60816 s, 3.5 GB/s Hmm, this makes no sense at all to me. Your configuration looks totally valid and you have plenty of memory in both nodes.

Daniel