These rates were even significantly smaller than the rates required for a direct "ssh -X" connection to the VM for the display of the chosen applications's graphical output on our remote X11-service.
Unfortunately, the gzip based compression of SSH led to some reduction in responsiveness when I moved windows fast and irregularly across the VM's desktop surface.īut when I worked with figures and operations of graphical applications (like Libreoffice Draw) within the "ssh -X" based display of the VM's Spice console screens on my remote client, I found much, much smaller data transfer rates. SSH data compression helped to bring data transfer rates below 9 MiB/s. However, without data compression, such an approach consumes a considerable part of the LAN-bandwidth as soon as reactions of the VM's window manager to fast window movements are requested on the remote SSH client: For a "virtio" video device of the VM we measured up to 45 MiB/s. With some additional SSH-tricks for audio data I got a well working, secure and surprisingly responsive solution for a remote desktop of a VM. I just added SSH to achieve a kind of elementary network capability: I transferred the graphical output of remote-viewer running on the KVM host via SSH to the X11-service of a remote client-system located somewhere in a LAN. In my last article I used a local socket based connection of remote-viewer to the Spice console of a VM on the KVM/Qemu host. KVM/Qemu VMs with a multi-screen Spice console – I – Overview over local and remote access methods
KVM/Qemu VMs with a multi-screen Spice console – II – local access with remote-viewer via a network port KVM/Qemu VMs with a multi-screen Spice console – III – local access with remote-viewer via a Unix socket KVM/Qemu VMs with a multi-screen Spice console – IV – remote access via SSH, remote-viewer and a Unix socket remote-viewer and virt-viewer - enable local or a remote users to work on the graphical desktops of a VM. I continue my article series about methods to access the Spice console of a KVM/Qemu based VM.
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