Ubuntu Wiki

This page lists some helpful steps when filing an ltsp bug

• It is very helpful if you include version numbers of the ltsp (or ltspfs) packages in your bug report (see below how to get the right version numbers for the various packages).
• If you modified any defaults in your thin client chroot, please mention this.
• Did you change anything in your lts.conf file (until gutsy in /opt/ltsp/i386/etc/, later in /var/lib/tftpboot/ltsp/i386/), if so, please attach it.
• Architecture: x86 or amd64
• Please tell how to reproduce the bug.

• See also: HelpingWithBugs

Get the versions of the packages:

dpkg -l ltsp-server
dpkg -l ltsp-server-standalone
dpkg -l --root=/opt/ltsp/i386 ldm
dpkg -l --root=/opt/ltsp/i386 ltsp-client
dpkg -l --root=/opt/ltsp/i386 ltsp-client-core # gutsy only

Is your bug related to local devices:

dpkg -l ltspfs
dpkg -l --root=/opt/ltsp/i386 ltspfsd

Debugging speed problems

Debugging tools

These tools you could use to monitor some speed problems, so you could find the bottlenecks:

• LatencyTop (http://www.latencytop.org) This tools monitors on what actions give the most latency in a process

• PowerTop (http://lesswatts.org/projects/powertop) (aptitude install powertop); PowerTOP is a Linux tool that helps you find those programs that are misbehaving while your computer is idle.

• SystemTap (http://sourceware.org/systemtap) (aptitude install systemtap); Very flexible/scriptable diagnostics tool

• xrestop (http://freedesktop.org/wiki/Software/xrestop) (aptitude install xrestop); Gives a top like interface on the processes which uses the most X-resources

• Cacti with snmpd (http://www.cacti.net/) (aptitude install cacti snmpd snmp); For monitoring system and network usage. Needs some work to setup

• Munin (http://munin.projects.linpro.no/) (aptitude install munin); Also for monitoring system and network usage. Easy to setup.

• ntop(http://www.ntop.org/) (aptitude install ntop); For network traffic monitoring.

• BootChart (aptitude install bootchart); For monitoring bootup speed. See also: http://www.hamilton.ie/gavinmc/edubuntu/bootchart.html and LtspBootPerformance

• See also: DebuggingProcedures

Configuration check

These things you need to check if they are working correctly on your system:

• Video drivers on the server (are they installed correctly?). You can check that via the /var/log/Xorg.0.log if the drivers are loaded correctly. Search for (WW), (EE) and (!!). The command cat /var/log/Xorg.0.log | egrep '(\(EE\)|\(WW\)|\(!!\))' should help you filter it.

• Video drivers on the client. Same as for the server, but now on a running LTSP client.
• Check if disk/file indexing is turned on on the server. This will give some disk usage. Which can slow the system down.
• Memory per client
• Disk usage per client

• For locking with sound, you could try to use PulseAudio fully. (in lts.conf: SOUND_DAEMON=pulse)

• Try another Window Manager (like ICEWM). It could be that Gnome is very slow. If that speeds up, you know what might be the problem.
• Check the load average with the command uptime.

Bugs not directly with LTSP, but affect LTSP environments

• Policykit not allowing remote sessions (Both ssh -X that ltsp uses, and NX sessions) to access admin functionality:

https://bugs.launchpad.net/ubuntu/+source/policykit/+bug/221363

Orphane processes

• gvfs-fuse sessions hanging around: https://bugs.edge.launchpad.net/ubuntu/+source/gvfs/+bug/252796

• gconfd-2 hanging around: https://bugs.launchpad.net/ubuntu/+source/gconf2/+bug/269541

• bonobo-activation-server

• LNS watchdog.txt from a school site that contains syslog info from gnome-watchdog

See also: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/49594

Workarounds / Solutions

• Workaround: For the ophrane processes, you can install gnome-watchdog (http://logicalnetworking.net/other/gnome-watchdog_0.9.2_i386.deb)

CategoryBugSquad CategoryDebugging