Too much network activity?

David Groos djgroos at
Sun Nov 15 16:47:03 GMT 2009

On Sun, Nov 15, 2009 at 9:57 AM, Steve Rippl <rippls at>wrote:

> On Sat, 2009-11-14 at 10:31 -0600, David Groos wrote:
> > Seeing Jim's e-mail about his computers being slow to log on is
> > motivating me to re-post to this previous post.  I'll repeat that
> > since the last few weeks, students have to wait maybe 2-4 minutes for
> > their log on process to finish.  I don't think it's worse in the
> > afternoon though--students are less patient at that time it seems.
> >
> > I haven't added new software to my LTSP server except for regular
> > updates.  I've had System Monitor on the last week a good bit.  2
> > things draw my attention, the first I already mentioned that there is
> > a lot of network activity even when only 1 TC is booted.  The other is
> > that the 4 CPU's seem to be maxing out for a few seconds then go to
> > around 60-70% about for 5-10 seconds, then again max out for a few
> > seconds.  When they peg at 100% it appears that's when another TC or 2
> > will get further logged in.  I'm not sure about how much logging in
> > happens during that maxing out period, but that is when the logging in
> > process seems to get furthered.
> >
> > I went to the logs, looked at a few but didn't know where to look and
> > nothing really jumped out to me.  Any thoughts about how to further
> > troubleshoot this?  Might be related to Jim's TC problems, too, anyone
> > else experiencing this?
> >
> > Thanks,
> > David
> Are the users on Network homefolders or local to whichever server they
> log into?  What specific processes are hogging the resources?  What
> version of Ubuntu?

Thanks for asking, Steve. Home folders are local to the server to which
students login.  We are using Jaunty.  The striking thing is that this
slowdown started a few weeks ago.  I tried server restart but need to be
more science-teacher like and record resultant log in times :).  I also
tried re-building the chroot Friday after school--will see if that has any
effect and report back what I find out.

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