Help! 10.04 LTSP becomes very slow to load and operate.

Todd O'Bryan toddobryan at
Sun Oct 31 22:03:16 GMT 2010

On 10.04 I've noticed that gnome-panel often eats up tons of CPU,
especially for people who aren't actually logged in. Slaying those
users solves the problem, but students have to let me know it's

I haven't seen it happening in the last week or two, so I don't know
if an update fixed the problem.


On Wed, Oct 27, 2010 at 2:39 PM, john <lists.john at> wrote:
> Hi David,
> Can you describe how older clients (or possibly just compaq clients)
> make things worse? Do you know why this might be. I have a number of
> older clients on the network and would be very interested to know if
> they are actually degrading the LTSP experience for more modern
> clients in some way.
> One thing I've noticed on any client you care to name is that it will
> often become "diconnected" from nbd somehow, and although it will
> continue to run, it will chatter frantically over the network to the
> server.
> Thanks!
> John
> On Tue, Oct 26, 2010 at 11:12 AM, David Hopkins <dahopkins429 at> wrote:
>> Jim,
>> Sounds very familiar to what I was experiencing ... check via top if
>> dbus is using 100% of cpu in which case this could be the issue I saw
>> with nofile defaulting 1024. (ps -u messagebus for the PID, then cat
>> /proc/PID/limits to see what the current limits are)  .. the load
>> averages were low but the system was almost non-responsive.
>> Also, if you are nfs mounting home directories, check the settings for
>> wsize and rsize.  I've found that 8192 works well with Ubuntu but my
>> prior setting of 32768 caused all kinds of random issues due to slow
>> file access.
>> I also found that with older hardware (specifically older Compaq
>> systems and systems with less than 128Mb memory) I could get one
>> misbehaving client which would slow everything down tremendously.
>> There was also an issue with flash and needed to set a couple of flags
>> for plugin-container:
>> ... I just made the changes directly in firefox.js as that was most
>> expedient.
>> And ... I found that I also needed to delete a lot of the old config
>> files for users when I migrated from K12LTSP based on RHEL4 to Ubuntu.
>> Just my guesses ...
>> Sincerely,
>> Dave Hopkins
>> On Tue, Oct 26, 2010 at 1:53 PM, Jim Christiansen
>> <jim.c.christiansen at> wrote:
>>> I've been fighting a huge slow-down of our current 10.04  ltsp 34 client
>>> system.  I'm not running local apps, the server has 8 gigs of ram and a 6
>>> core processor.  The cpu load is rarely over 30 or 40 % and swap is never
>>> used.  One nic on the server attached to a 100 megabit unmanaged switch.
>>> The slowness comes unexpectedly and a restart may not improve the situation.
>>> The wierd part is if I fire up our old K12LTSP server things work normally
>>> as ever...
>>> Does anyone know how to diagnose this problem?  I don't know if our network
>>> is saturated/maxed out, if the wiring has gone downhill and become
>>> problematic again, or if I have an internal server setup mistake.  I'm on an
>>> internal 192.168.1 subnet and think I've edited the system files properly.
>>> Thanks,  Jim
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