Windows VM memory

[chudak]

Hello

I have a windows 10 vm, memory set as 2/30 GB ballooning device

In the VM I see that only ~3 GB of RAM allocated, however proxmox shows always ~25 GB used.

Is it expected?

PS: Ubuntu vm behaves differently and does not show such a high amount of memory allocated
Thx

 

[Dominic]

Hi,

have you installed the VirtIO Balloon Driver as outlined in the best practices? If so, which version are you using exactly?

 

[chudak]

Hi,

have you installed the VirtIO Balloon Driver as outlined in the best practices? If so, which version are you using exactly?

I have virtio-win-0.1.187
Is it good ?

 

[chudak]

Updated to virtio-win-0.1.204 and still see the same

@Dominic are you saying it should not be this way ?

 

[spirit]

from the host perspective, windows reserve all memory at boot (filling memory by zeroes).

without the balloon driver (+ ballon service), you see the memory allocated on host
when ballon driver is installed, you see the memory from inside windows. (but the full memory is still allocated on host).

Hopefully, we have the ksm feature on the host (triggered at 80% memory host usage), which deduplicate zeroes pages, so memory is recovered.
(Another way to free host memory, is to live migrate the vm, the memory will not be reserved on target host)


Linux vms don't reserve memory at boot. (yes, windows sucks)

 

[chudak]

from the host perspective, windows reserve all memory at boot (filling memory by zeroes).

without the balloon driver (+ ballon service), you see the memory allocated on host
when ballon driver is installed, you see the memory from inside windows. (but the full memory is still allocated on host).

Hopefully, we have the ksm feature on the host (triggered at 80% memory host usage), which deduplicate zeroes pages, so memory is recovered.
(Another way to free host memory, is to live migrate the vm, the memory will not be reserved on target host)


Linux vms don't reserve memory at boot. (yes, windows sucks)

In other words what I see is as it works, Yes?

Thx