I used this handy tool to run system call preliminary benchmarks: http://code.google.com/p/byte-unixbench/
In a nutshell, what I found is a confirmation that live migration does indeed degrade performance on precise KVM. I hope the below results help narrow down this critical problem to eventually have it resolved in 12.04 LTS version. detail results: Compiled the benchmarking tool and then: root@sample-vm:~/UnixBench# ./Run syscall Output: ** before live-migration ** ------------------------------------------------------------------------ Benchmark Run: Wed May 01 2013 20:29:54 - 20:32:04 1 CPU in system; running 1 parallel copy of tests System Call Overhead 4177612.4 lps (10.0 s, 7 samples) System Benchmarks Partial Index BASELINE RESULT INDEX System Call Overhead 15000.0 4177612.4 2785.1 ======== System Benchmarks Index Score (Partial Only) 2785.1 ------------------------------------------------------------------------ ** after live-migration ** ------------------------------------------------------------------------ Benchmark Run: Wed May 01 2013 20:35:16 - 20:37:26 1 CPU in system; running 1 parallel copy of tests System Call Overhead 3065118.3 lps (10.0 s, 7 samples) System Benchmarks Partial Index BASELINE RESULT INDEX System Call Overhead 15000.0 3065118.3 2043.4 ======== System Benchmarks Index Score (Partial Only) 2043.4 ------------------------------------------------------------------------ XML domain dump: <memory>1048576</memory> <currentMemory>1048576</currentMemory> <vcpu>1</vcpu> <cputune> <shares>1024</shares> </cputune> <os> <type arch='x86_64' machine='pc-1.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='HIDEME'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='HIDEME'/> <target dev='hda' bus='ide'/> <readonly/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> -- 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/qemu/+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