Few updates from a few tests we ran:
Setup:
hypervisor ==> Ubuntu 12.04.2 LTS
libvirt ===> 0.9.8-2ubuntu17.7
qemu-kvm ===> 1.0+noroms-0ubuntu14.7
storage: NFS exports
Guest VM OS: Ubuntu 12.04.1 LTS
Test 1: Created a new VM and kept it Idle for 60+ hours, then ran Unix
benchmark test against it
Same thing happened with us with running ubuntu precise kvm for our
hypervisors. VMs that are live-migrated suffer noticeable performance
degradation. We tried a few performance tests against live-migrated vs
non-migrated VMs and the problem is easily reproducible.. (we used
jmeter)
Ubuntu (hyper
