[X2Go-User] x2go performance again

Robert Dinse nanook at eskimo.com
Mon Jan 30 10:57:15 CET 2017


      I used to be able to get full motion video even over my cable modem but
no more.  Something has changed and not for the better in terms of performance.

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On Mon, 30 Jan 2017, Stefan Seidel wrote:

> Date: Mon, 30 Jan 2017 10:42:01 +0100
> From: Stefan Seidel <sseidel at vub.de>
> To: x2go-user at lists.x2go.org
> Subject: [X2Go-User] x2go performance again
> 
> Hi,
>
> some time ago I inquired about peoples experience with x2go in a LAN
> environment. I have now built a TCE live system (TFTP-only, no NFS) and a new
> Jessie server and I am still not very satisfied. I tried almost all available
> options. Here is the setup:
>
> 1GBit/s LAN on both sides
> Host: AMD 4.4GHz 8-core CPU with 32GB RAM
> Client: Pentium D 2.8GHz, 1GB RAM, nVidia 6200 with 2 screens at 1200x1600
>
> I tested MATE desktop with Firefox 51 (tried XRender on/off) and Chromium 55. I
> usually set the browser to fill half of the screen, that mean roughly the same
> number of pixels as a Full-HD (1920x1080) screen. I usually open
> https://www.heise.de and scroll up and down a bit.
>
> nopack: almost the best of it all, responsiveness good, Chrome and Firefox
> without XRender laggy
>
> rfb-hextile/tight: better for small screen updates, worse for large screen
> updates, scrolling in Firefox with XRender active is *very* smooth
>
> rdp: almost identical to rfb
>
> adaptive: middle ground, everything is laggy but at least there's always the
> same amount of lag for small and big screen updates. Unacceptable though
> because almost all text has JPEG artifacts no matter whether the quality is
> set to 1, 7 or 9. Graphics like Munin graphs are really ugly.
>
> 16m-png: good quality, mostly lag-free except Chrome and Firefox when XRender
> is off, becomes very unresponsive with lots of screen updates
>
> 16m-jpeg: artifacts, speed like adaptive
>
>
> I believe nopack or rfb would give better performance if it was possible to
> circumvent going through SSH. I have set SSH to use arcfour (this is a
> trusted, isolated LAN) and performance has been slightly better.
>
> Is there any way of making the initial authentication and startup through SSH
> but then having the NX connection going directly to the client? That would
> save a lot of processing power! (I'm thinking similar to the "tunnel" feature
> for sound.)
>
> Regards,
>
> Stefan


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