On Wed, 2012-06-06 at 10:10 -0400, John A. Sullivan III wrote: > On Fri, 2012-06-01 at 08:32 +0200, Mike Gabriel wrote: > > Hi, > > > > just for the record and to let people know about current work focus... > > > > People (esp. John) have reported occurrences of a very sluggish > > behaviour of various applications when run in X2Go sessions. > > > > We developers can now confirm this. Ubuntu users reported this > > earlier, Debian user can now also experience such a sluggishness. > > > > Reproduce on Debian: > > > > * add squeeze-backports archive to your system > > * install iceweasel (esr version) > > > > This will drag in a libcairo from squeeze backports that is very > > probably the cause for making some applications very slow within X2Go > > sessions. > > > > Libcairo is used in all GTK applications and is a layer between GTK > > and the rendering backend (X11, OpenGL, ...). With some recent version > > of libcairo the sluggishness got introduced... > > > > @John: so it is not Nagle, I guess... > > > > Compare: launch gnome-terminal (uses libcairo) on such a system and > > xterm (uses direct X11 rendering). Now create some output on standard > > out and then scroll back the shell history... > > > > Alex has become aware of this on Linux Day Berlin and he has put it on > > his list with high priority to find a solution/workaround for that. > > > <snip> > Hmm . . . as I think about it, although I eagerly await this fix, I > believe we are looking at two separate issues. We are still running > 3.0.1 series on our production servers and clients because of this issue > (and some others). However, I personally run the latest client from > heuler. I have the problem on both the latest x2goserver and the old > 3.0.1-5 x2goserver. It appears to be a client and not a server issue > and appeared with the move to libssh. > > The delay is not inconsequential. We are not talking about a sese of > sluggishness with a 250ms delay. We are talking about a 2 to 5 full > second delay for the final keystrokes or screens to appear. Everything > else until the final bit is lightning fast even on WAN links - John <snip> I happened to have an old 3.0.1-7 plugin sitting around and tried that. I observed some of the same naglish behavior so it may not be the x2goclient. Unless someone else is experiencing this, I need to investigate our environment more fully before sending the devs on a fruitless search - John
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