There's nothing in syslog for the VM or host that would imply performance degradation.
I have done this with hugepages and made sure huge page use was consistent. Previously I disabled hugepages and didn't see a difference but I haven't tested again. I'm using (C)LVM back off FCoE/SAN but I haven't tried local LVM/qcow2 type backing. I'm using libvirt, but the command line ends up looking like this, if you would like I can provide XML for libvirt as well. /usr/bin/kvm -name one-10 -S -M pc-1.3 -cpu Westmere -enable-kvm -m 73728 -smp 16,sockets=2,cores=8,threads=1 -uuid 5ee0afd3-df3f-fb1f-02bd- 7cde2bc4ee95 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-10.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -no-shutdown -device piix3-usb- uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/one//datastores/0/10/disk.0,if=none,id=drive-virtio- disk0,format=raw,cache=none -device virtio-blk- pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio- disk0,bootindex=1 -drive file=/var/lib/one//datastores/0/10/disk.1,if=none,id=drive- ide0-0-0,readonly=on,format=raw -device ide-cd,bus=ide.0,unit=0,drive =drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=23,id=hostnet0 -device virtio-net- pci,netdev=hostnet0,id=net0,mac=02:00:0a:64:02:fd,bus=pci.0,addr=0x3 -vnc 0.0.0.0:10,password -vga cirrus -device virtio-balloon- pci,id=balloon0,bus=pci.0,addr=0x5 I'll try experimenting more with THP disabled and different IO backends. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu-kvm in Ubuntu. https://bugs.launchpad.net/bugs/1100843 Title: Live Migration Causes Performance Issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1100843/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
