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An interesting behavior in VM live migration

I conducted some experiments with VM block live migration. I have two VMs. VM1 is the one which has been launched from an image (Ubuntu 14.04 server 64bit image). VM 2 is the one which has been created from an snapshot of VM 1. Now, when I live migrate vm 1, the total migration time is something around 100 ms, while the total migration time for the VM 2 is around 10ms. I repeated the migration for both VM 1 and VM 2 and each time the results are almost similar. Both VM1 and VM2 are exactly the same. the only difference is the way they have been launched. I also installed more applications on VM2 and then repeated the migration. Again, the VM2 migrated in shorter time than what VM2 did.

Does anyone knows what causes this difference in migration time and how it can be explained?

Thanks

An interesting behavior in VM live migration

I conducted some experiments with VM block live migration. I have two VMs. VM1 is the one which has been launched from an image (Ubuntu 14.04 server 64bit image). VM 2 is the one which has been created from an snapshot of VM 1. Now, when I live migrate vm 1, the total migration time is something around 100 ms, while the total migration time for the VM 2 is around 10ms. I repeated the migration for both VM 1 and VM 2 and each time the results are almost similar. Both VM1 and VM2 are exactly the same. the only difference is the way they have been launched. I also installed more applications on VM2 and then repeated the migration. Again, the VM2 migrated in shorter time than what VM2 VM1 did.

Does anyone knows what causes this difference in migration time and how it can be explained?

Thanks