On Thursday 31 May 2007 11:39:03 am Gavin McCullagh wrote: > Hi, > > I don't know much about K12LTSP. What version of LTSP does it use? > Edubuntu uses LTSP v5 which may be the difference in some of these. > > The older LTSP (as I understand it) uses XDMCP straight across the network, > whereas v5 uses ldm running locally to start an ssh tunnel to the server. > This tunnel might have an effect on application responsiveness. > > Is local device support (usb keys, digital cameras) work on K12LTSP thin > clients? > Yes, it has local device support. K12LTSP 6.0 uses FC6 and LTSP 4.2. The next version will have LTSP 5 integrated such Edubuntu.
> On Thu, 31 May 2007, Ray Garza wrote: > > Booting to the logon screen is about the same. > > -- Edubuntu: 1 minute and 33 seconds > > -- K12LTSP: 1 minute and 42 seconds > > That's interesting. Edubuntu is sometimes very slow to boot on thin > clients but seems not to be here.. > > > Going from the Logon screen to the Desktop, K12 is a lot faster. > > -- Edubuntu: 17s > > -- K12LTSP: 6s > > Interesting. If you turn off LOCALDEV and SOUND on a thin client (just for > the sake of interest), does this change much? > It could be but since I booted from a floppy I did hear a lot of floppy accesses. I got a nother PC (thats a Celeton 1.4 GHz) that can boot from the NIC and see if there is any difference. > > Playing Tux Type w/sound is a lot faster on the K12 system > > -- Edubuntu system: Tux Type was very slow even at its Highest level > > (Commander w/short words) > > -- K12LTSP system: Tux Type played just fine > > Possibly due to the tunnel. > I'm gonna try that 1.4 Ghz Celeron PC and see if that makes any difference. > > Another thing that I noticed is that I can't (or couldn't figure out) > > change the logon screen on the client PC. On the K12 system I would goto > > System-->Administrator-->Logon Window and make the changes there but it > > doesn't work on Edbuntu. > > This is the difference between ldm and xdmcp. You need to modify some > settings in /opt/ltsp/i386/usr/share/ldm/themes/ to change the thin client > login screen in edubuntu. > Ok, thanks, I'll poke around with that. > > The Dell Optiplex 620 works fine under Edbuntu. Sound works on the > > Applications that have sound and Tux Type or Tux Math work fine. Maybe > > I'll use Edbuntu for the lab with the new Dell's and K12 with the older > > stuff. I would like to run both with one system. > > The ssh encryption adds a CPU load to the thin client (and the server). > This may be part of the problem here if your more powerful thin clients > aren't bothered. > > > Any comments? Anthing I can do to get Tux Type and Math to run at it's > > normal level? I imagine that if I switch to NIC that can boot off the > > Network some of the sluggishness will go away. > > Various people have suggested patches to openssh to add a null cipher, ie > to not encrypt data in transit. The guys at PSC provide a patch: > > http://www.psc.edu/networking/projects/hpn-ssh/ > I could try that but it'll be next week before I can get to it. My overall impression of Edbuntu is good. I really like getting basic sound to work with out a lot of hassle. The rest is just a learning curve that I have to go through. Ray -- edubuntu-users mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
