SPICE performance sluggish

[kazi]

Hi,
Everything working fine except spice over vpn. It's really slow. The client VM is 32 GB memory. and How to resolve this issue?
Thanks

 

[gfngfn256]

What's your SPICE memory set at?

 

[kazi]

I set SPICE memory 32MiB.

 

[kazi]

The problem is when I use inside the Network (LAN) , the spice is working fine but when I use over VPN then really slow. How to overcome this issue? Most of the users are using VPN to use their VM.

 

[leesteken]

The problem is when I use inside the Network (LAN) , the spice is working fine but when I use over VPN then really slow. How to overcome this issue? Most of the users are using VPN to use their VM.

VPN needs CPU (for encryption etc.) and bandwidth; increase both for better performance. I fail to see how Proxmox is involved here.

 

[itret]

What kind of VPN you use?

 

[kazi]

We are using OpenVPN.

 

[itret]

We are using OpenVPN.

IMHO OpenVPN is responsible for poor performance. It's secure but slow. I would use Wireguard in your setup.

 

[emunt6]

We are using OpenVPN.

Change the OpenVPN server protocol to UDP and remove/disable TCP.

 

[kazi]

My vpn server is already setup

# TCP or UDP server?
;proto tcp
proto udp

But still slow. My all users are complaining about the slow spice behavior. please help me. I have over 300 VMs.

 

[_gabriel]

compare vs direct plain tcp connection.

edit: OpenVPN is fast as Wireguard when using Wintun driver or even better with its own driver OpenVPN DCO.
https://openvpn.net/blog/openvpn-data-channel-offload/

 

[kazi]

I am using Rocky 8 for OpenVPN server, I did not find the kmod-ovpn-dco and the dependency package dkms. Do you know the url?

 

[emunt6]

My vpn server is already setup

# TCP or UDP server?
;proto tcp
proto udp

But still slow. My all users are complaining about the slow spice behavior. please help me. I have over 300 VMs.

This is okay, server using UDP.

Can you check on the Proxmox server the CPU performance and clock-speed settings?

cat /sys/devices/system/cpu/*/cpufreq/scaling_governor
cat /sys/devices/system/cpu/*/cpufreq/cpuinfo_max_freq

It is possible, the "PowerSavings" options (C-States) downclocking the CPU performance, if true, then set to "perfomance" or disable all "PowerSavings" option in BIOS.

$> apt-get install cpufrequtils

$> cpufreq-info
$> cpufreq-set -g performance
$> cpufreq-info

/etc/init.d/cpufrequtils
GOVERNOR=performance

$> systemctl daemon-reload

 

[kazi]

After change GOVERNOR=performance, now it's much better.
Thanks

 

[melroy89]

I changed display driver to VirtIO-GPU and voila! My performance are great using virt-viewer. Basically zero input lag.

Ps. I'm testing now with Ubuntu 24.04, which is running Wayland by default.