On Sun, Jun 04, 2017 at 11:43:35AM +0200, Hui Jing wrote:
Hi All, I am wondering when we do live migration, how much memory is transferred? I guess it must be one of the three below, but not sure which one: 1. The amount of memory allocated to VM 2. The memory currently used by VM (actual Mem usage in guest) 3. The memory used by the qemu process (RSS).
It is more complicated than that. You need to transfer all the memory that the VM used, that's for sure, right? Then it depends on the hypervisor whether or not they include the nulls, how much of their memory they need transfer, how much memory is there for all the devices that the VM has, whether there's any compression algorithm applied, and, most importantly, you need to retransfer any memory that was changed after it was transferred. And when you are re-transferring, the same can happen. So at the end it depends on how fast your guest is changing how much memory and how fast your transfer is. Plus bunch of other things that I forgot, for sure.
Best Regards, Hui
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