I think Rohit nails it here with regards to the performance penalty.
Historically the web console has only been used for basic or recovery
operations, not meant for long term, day to day use. As he suggested RDP
is a much better solution (by miles) and if you're target is Linux then
look at X2Go or FreeNX.
If you want to measure like for like, then what you can do is connect to
the KVM's VNC port directly using virt-manager or virt-viewer (you'll
need to get the VNC password from the DB and decrypt it).
On 2023-11-01 12:37, Rohit Yadav wrote:
In case you've compared using KVM, by default the noVNC console is
encrypted by CA framework b/w CPVM and the hypervisor host, which could
induce some performance pressures.
Also bear in mind you may be comparing:
VM <- Proxmox vnc server -> novnc client in your browser (is this SSl
enabled?)
versus
VM <- CloudStack KVM host encrypted qemu/vnc server -> vnc-over-TLS ->
cpvm agent (reverse proxy) -> secured accessed your browser (in case of
SSL enabled CPVM)
In the latter (case with CloudStack), there is a double
encryption/decryption that happens on the CPVM side on both sides.
Regards.
________________________________
From: Murilo Moura <[email protected]>
Sent: Wednesday, November 1, 2023 16:22
To: [email protected] <[email protected]>
Subject: Re: noVNC performance
Hi Yadav!
Yes, I even made this comparison with the same server where I was
running
Proxmox before. As for the client, I also accessed it from the same
source
that I previously used with Proxmox noVNC.
I have the impression that there is some tuning opportunity that I
haven't
found yet, given that the noVNC library is used in both projects
(Proxmox &
Cloudstack), but with very different results.
On Wed, Nov 1, 2023 at 7:26 AM Rohit Yadav <[email protected]>
wrote:
Hi Murilo,
Have you tested/compared VNC based traffic between CloudStack VMs and
proxmox (or others) from the same server and client locations?
Depending on your env, if you've a busy console proxy you can try to
upgrade the systemvm (CPVM) offering with more CPU (cores and speed)
and
look at the network setup.
You could also explore alternatives, for example if the guest VMs have
RDP
setup/install such as in case of Windows VMs, you could use a RDP
client
such as the Microsoft remote desktop app on the client side. In my
experience, RDP client with guest VMs have better performance and I/O
(webcam, microphone, speaker) than compared with VNC (noVNC).
Regards.
________________________________
From: Murilo Moura <[email protected]>
Sent: Wednesday, November 1, 2023 08:23
To: [email protected] <[email protected]>
Subject: noVNC performance
Is there any instruction to optimize the performance of the graphical
console via noVNC? For virtual machines with desktop enabled, the
performance of the noVNC console is very low.
I came from experience with Proxmox and in it the noVNC console, even
protected by SSL, is much superior. That's why I wondered if there was
any
way of tuning noVNC in ACS.
