On Sat, 2011-05-28 at 11:52 -0400, brian mullan wrote:

John

I've done this quite a bit and have not seen this problem

x2go client on ubuntu --(a)--- AWS EC2 Ubuntu desktop ---(b)--- AWS EC2 Windows 2003 serverl * link (a) is 15 Mbs cable connection * link (b) is 10Gbps ethernet A few thoughts I'd have are: * is only RDP affected?
* From x2go client can you log into the x2go server and do an extended PING (say 20 iterations or so) to the Windows Server to see if PING's response time is changing? * are you sure there are no network issues on the link btwn the x2go server to the windows server? as it sounds like the VPN test went directly to the Windows server leaving out the link between the x2go server and Windows Server * Are you able to log directly into the x2go server ...not using x2go ... and run rdesktop directly to the window server just to see if RDP is having a problem over that link? Brian

Thanks, Brian. The WAN connections we are testing on are intentionally considerably slower than 15 Mbps. Only RDP is affected. The performance of all other X2Go applications is splendid. In fact, I did the same kind of line painting test using KWrite instead of notepad and it flew - same system, same time. The X2Go Server and Windows servers are on the same switch and all seems fine. Indeed, the VPN test bypasses the X2Go connection and runs much better.

We are going to have a look at SPICE and see what that does for us. SPICE has come up a couple of times on this list and I've mentioned the last time I looked at it, it was a great LAN protocol but a terrible WAN protocol.

I've just taken a couple of hours to reacquaint myself with it and it has come a long way. It now does caching to reduce latency and bandwidth. It uses compression and not only does it use compression but it uses adaptive compression as I thought only HP was doing. In other words, it uses lossless compression for text and most screen updates but, if it detects massive, rapid changes, it will assume it is streaming video and shift to a lossy compression. It then does "lipsync" between the audio and video stream.

That means video has a fighting chance at last. This is the alternative approach to the Citrix method of copying the video and then playing it locally (as Mike has duplicated with Mimebox - an excellent idea with much potential).

As we consider what to do with the ongoing saga of NX, we may want to consider SPICE after all. I'll let the list know how our testing goes if anyone is interested - John

    ---------- Forwarded message ----------
    From: "John A. Sullivan III" <jsullivan@opensourcedevel.com>
    To: x2go-user@lists.berlios.de
    Date: Fri, 27 May 2011 15:49:50 -0400
    Subject: [X2go-user] Performance issues using RDP
    Hello, all.  We were very eager to experiment with TSPlus
    (http://www.tsplus.net) as an alternative to Microsoft RDS.
     We have
    been assuming all along that performance of any RDP solution
    is better
    in a low bandwidth WAN environment if we put X2Go in the
    middle of it
    and run rdesktop from the X2Go Server to a local Windows
    server.  Our
    results were very disappointing with both TSPlus and RDS and
    with both
    rdesktop and xfreerdp.
    
    Has anyone else experienced the same poor performance or, more
    importantly, has anyone worked around it?
    
    We noticed that screens seemed to be painting line by line -
    not sure if
    if it is the entire screen or just the active window.  It also
    made
    mouse movements very erratic in TSPlus + rdesktop.  TSPlus +
    xfreerdp
    seems better.
    
    To demonstrate this, I opened notepad in a large window in a
    full screen
    session, typed an entire line, copied it to the clipboard and
    then held
    down <CTL>V to paste it.  The first few lines flew but then it
    became
    very slow and we could see the flicker of each line painting.
    
    I also opened Internet Explorer and went to
    www.spiritualoutreach.org -
    a very poorly designed site I put up years ago with long pages
    and far
    too large graphics.  I sat and watched the screen paint a band
    at a
    time.  I opened one of the large template documents and
    vertical
    scrolling was nearly impossible.
    
    I'll paste in some of our internal notes below.  Thanks - John
    
    
    

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