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From Dogbert <>
Subject Re: Performance tuning
Date Wed, 21 Sep 2016 17:06:02 GMT
Hi Frode,

Well some context this project, I  inherited when I joined my current
company, and one that offshore couldn't quite get working. While I know
that historically they've had slower performance with NoVNC, and I think
the issues were more on the high latency end, with customer on the other
side of the planet. I know that IT is looking into local data centers to
help this, but my current task is to figure out what knobs and dials I can
tweak, to eek out a little more performance.

I'm not even sure how to test performance, other than putting it on a
server, and have customers we are friendly with give it a try. Which is
something we will do. Locally testing the performance seems to be fine. The
latency between  the vnc server and the Guacamole server(Guacamole in our
custom app), should be minimal, as in Dev they are on the same box, and in
Prod they would be in the same data center. I'll have to ask IT for some
number on that, just to make sure.

Right now I haven't set any encoding in the user-mapping file, so we just
have the defaults. From what offshore told me this morning, offshore said
these didn't make any difference. Not that I believe that. So are there
things there that I can tweak?  Also in my app I'm not using that file, but
I do the equivalent, when I create the tunnel, setting the config. Right
now I'm just setting the host, port and password. I've played with
color-depth, which I can set to 16 or 24, I tried 8 but got a 515 error.


On Wed, Sep 21, 2016 at 11:44 AM, Frode Langelo <> wrote:

> Hi Tucker,
> Which specific performance issues are you seeing? Do you have high latency
> and/or low bandwidth requirements?
> What does the network latency and available bandwidth look like between
> your VNC server and Guacamole server?
> The VNC encoding parameters for the VNC server connection are set to "tight
> zrle ultra copyrect hextile zlib corre rre raw" by default in
> libvncclient. Have you explicitly set (and overridden) these encodings parameters
> in your user-mapping.xml file? If so what are those parameters.
> Regards,
> Frode
> On 9/21/16 8:03 AM, Dogbert wrote:
> Hi,
> So I'm in the middle of a POC to replace NoVNC with Guacomole over
> web-sockets. We currently use TurboVNC(with virtualGL) as our vnc server. I
> looked through the documentation, and I didn't see much that I could tweak
> for performance other than color-depth. Is there anything I'm missing that
> I could tweak to help performance, like a quality setting? Or would
> changing the VNC server have any effect?
> Thanks,
> Tucker

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