iGPU passthrough and Memory usage problem

[dfc643]

hi everyone,

i have a vm host with Intel i5-3470, and i have a win2012 vm in pve. i tried enabled iommu and vfio perparing for iGPU passthrough. everything seems works fine but vm have very high memory usage (99%).

note:
* iGPU passthrough works in legacy mode (legacy-igd=1) due to only supports legacy mode for gen-3 intel processor.
* added "-set device.hostpci0.x-igd-gms=1" in args.

is anybody has the same problem? and how to solve it?
thanks!!!

 

[Dunuin]

When using PCI passthrough the VM is always reserving the full RAM as DMA needs to be able to access the whole RAM at all times.
So you best not give the VM more RAM than it needs. Did you setup the QEMU guest agent for correct memory reporting? https://pve.proxmox.com/wiki/Windows_2012_guest_best_practices#Guest_Agent

 

[dfc643]

When using PCI passthrough the VM is always reserving the full RAM as DMA needs to be able to access the whole RAM at all times.
So you best not give the VM more RAM than it needs. Did you setup the QEMU guest agent for correct memory reporting? https://pve.proxmox.com/wiki/Windows_2012_guest_best_practices#Guest_Agent

hi Dunuin, thanks for your reply
i tried set ram size to 3GB and 4GB for win2k12 vm, but memory usage both 99%. i has been installed qemu agent for win2k12 vm. and win2k12 reports memory usage are 99% too.....