Re: [Qemu-devel] windows guest virtio serial and balloon driver test issues

[Mark Wu <wudxw@linux.vnet.ibm.com>]

> Total physical memory on Windows will always be the same,
> because we don't hot-plug/unplug physical memory.
> Balloon driver works with non-paged pool memory instead.
> So, every time you inflate or deflate balloon in your system,
> you should see "Available memory" is changing, while physical
> will always be the same.
But the behaviour of virtio-balloon is different on Linux guest. It 
updates the totalram_pages on deflate/inflate. Therefore the total 
physical memory will be updated in the system management interface even 
though it doesn't really hot-plug/unplug any physical memory.  If we 
just use 'info balloon' to query the balloon status, that should be 
fine. But if the VM management tool also collects  memory information 
from guest, it will become confusing.  Actually, I am not sure which one 
make more sense. I just think that it should have unified behaviour on 
both Linux and Windows guests.