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 _______________________________________________ X2Go-Dev mailing list X2Go-Dev@lists.berlios.de https://lists.berlios.de/mailman/listinfo/x2go-dev
