Hello.
I installed a Windows 10 KVM guest through libvirt on an openSUSE host. I use it with SPICE console through host's installed package virt-viewer. The guest uses qcow2 storage format, and has RAM ballooning range of 2 Gb - 3 Gb. I installed all due drivers in the guest through spice-guest-tools installer.
Host hardware is a laptop probably dating from 7-8 years ago, with i3 2.53 GHz, 4 Gb RAM, and a 7200 rpm SATA hard disk. Yes, it's a bit old already.
From the moment Windows finishes booting and prepares to load the login screen -the one with the hour before choosing a user-, it takes a minute or more to actually load the login screen, and even when it does it takes more time to even become responsive.
So I finally get to enter the desktop, and wait some more seconds to let it finish load all the stuff it needs. But in summary, when totally ready to use, the guest always feels generally slow: programs or windows take time to be able to load -even if just the file manager-; some times they never even open. And if stressing the guest just a little more in order to do a bit of daily work such as opening web browser or a couple of MS Office documents, it just hangs and becomes unresponsive and broken.
I tried with a VNC console and also RDP. Though they feel laggy in general, they are definitely quite usable in comparison with what I'm getting with SPICE.
This is making no sense. AFAIK, SPICE was designed to be a "faster" protocol than VNC, and it's being totally the opposite, at least for me.
Out of curiosity I tried another Windows 10 KVM guest, also with RAM ballooning 2 - 3 Gb, but this time installed in an apart server using Proxmox VE, with RAW storage format. The server is in the same local network segment as my host.
I got exactly the same results: slow SPICE, fast VNC, even when guest is not even installed in host itself but in an external server, being accessed through LAN. Local network had no traffic by the way; just laptop host and Proxmox server there.
I used to think it was problem with my host's hardware. But the test in the Proxmox server would suggest not. In Proxmox I tried increasing guest's RAM to 6 Gb with no real difference neither, while with VNC console it worked ok with just the 3 Gb RAM.
Could anyone help please?
Thanks beforehand.
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