Peter, You have several options available:
1. LDM_DIRECTX (set to True in lts.conf, video will not be tunneled through ssh and go back to the client directly) 2. LOCAL_APPS - install java and java programs in the chroot and run them as local apps rather than from the server - do the same with ff and plugins 3. See if you have the optimal video drivers for the thin client 4. Disable compiz if it is running on the server These are off the top of my head. -Gadi On Tue, 2009-08-11 at 18:34 +0200, Peter Stein wrote: > Dear LTSP users, > > when it comes to convince somebody of LTSP the usability and feeling > is crucial. After setting the chroot up we started testing. And here > the real problems begin. Our users are scientists, they work for hours > in front of their monitor and they are *sorry* pissed if the computer > is somewhat sluggish or unusable. > We have enormous problems using Java programs like xmaple and others. > Some are usable, some not. I am aware of the bug here > https://bugs.launchpad.net/ubuntu/+source/ia32-libs/+bug/277069 and > installed the libxcb package of Ubuntu karmic which improved the speed > a lot. But still it sucks to work with thin clients somehow. > > - moving windows is sometimes decelerated > - firefox dropdown menus still open slowly sometimes (not in konqueror) > - input in some java programs like xmaple lags - the program is not usable > - videos are not shown with enough fps > > I have analyzed the traffic a little bit. If you move a window like > gnome-terminal traffic jumps to 5-6 MB/s sometimes. CPU of xorg goes > up to 45%, ssh uses 20%. If one uses xmaple or other Java programs > load goes up to 1.15 which is too much for a single core terminal, > traffic jumps to 14-15 MB. This is more than maximum for a 100 MBit/s > connection, which is still kind of standard (but tested with GBit/s). > > We use: > Ubuntu Jaunty for servers and chroot > terminals have sempron 2100+ (that's not really slow for a terminal) > ATI X1200 with free radeon driver > the server I used for testing has more than enough power: 8 cores and 16GB RAM > > I also tried hpn-ssh http://www.psc.edu/networking/projects/hpn-ssh/ > with no sufficient result. > So the problem is: > > In many cases (like moving a window etc.) xorg and ssh use too much > cpu. We changed ssh encryption to blowfish which helped only a little. > What can I do to improve this situation. I ran out of ideas. One > important program which doesn't work, is enough to make this project > rubbish. All my work was for nothing and that would be very > disappointing. > > Thank you very much. > > > > Peter > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _____________________________________________________________________ > Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: > https://lists.sourceforge.net/lists/listinfo/ltsp-discuss > For additional LTSP help, try #ltsp channel on irc.freenode.net -- -------------------------------------------------------- Gideon Romm | Proud LTSP Developer [email protected] Support LTSP! Buy your hardware at: www.DisklessWorkstations.com www.DisklessThinClients.com (use coupon code: LTSP5P for 5% off thin clients from DisklessThinClients.com) ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
