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. (NO Live-migration/migration) Result 1: The performance was NOT affected and the result was the same as a fresh VM. Test 2: Created a new VM, and perform a "virsh save <domain> <file>" followed by a "virsh restore <file>" on the SAME hypervisor. Then run unix benchmark against it. Result 2: The VM is AFFECTED (cost to perform system calls degraded by ~21% ) Test 3: Rebooted the affected VM from test (2) and re-ran unix-benchmark tests against it. Result 3: Performance is back to normal and is identical to a newly created and non-migrated/not-saved VM. Thus, it seems the problem is also exposed by "saving" the running precise domain (memory pages) to state file followed by a "restore" even on the same hypervisor and not necessarily live-migration to a different host. -- 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
