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
