Hi Poul,
Poul Moller wrote:
Hi list,
I'm running LTSP 4.1.1 on a 3GHz/2Gb box under FC2. I'm experiensing
complete LAN freezes quite often, and I'm really without a clue.
(The harsh environmet is a middle school in Rome, and it is really
harsh. Students may click on every icon they see on the desktop just to
see what happens. They might unpluck mouse/keyboard cables, stick
pencils into floppy drive, kick the PC if it doesn't work
instentaniously. You should see it...you won't believe it)
I believe it.
The server is running but needs a re-boot to survive the LAN freeze.
Unfortunately I'm not present when the system freezes, I only have the
syslog to go from. Attached is the last part just before all clients die.
Clients are 10 to 12 Compaq Deskpro 64Mb, configured using XSERVER=vesa
in LTSP. I'm not able to reproduce the problem manually (I guess I'm not
that harsh). I have loaded OpenOffice and Firefox on all PCs using only
about 60-70% of the server RAM. I have started X11 screen savers with
moving graphics on all clients to stress the network but it always works
when I'm around.
I hope this rings some bells in someones ears, since I really need some
hints for debugging.
My setup hasn't been that badly abused physically, but it's seen some
action ;). The main culprit for almost any kind of freezes here, have
been things like Kasteroids, flash games via Internet - any graphics
and/or processor and/or bandwidth hungry game.
Try mimicking a frustrated teenager on edge with 0.01 second patience
span waiting for "just a jpg picture" of 5 MB to load in Gimp, furiously
double-clicking it incessantly to make it load faster. Substitute with
any more or less heavy file in any more or less heavy app, and you might
get such a freeze too.
Other than that:
- Are there any external factors that might play in? What does the
network topology look like? I've had things like wrongly plugged in
cables give me two competing DHCP servers on the LTSP net and worse.
- What speed is the network, switches etc.?
- Any hardware and/or connection errors?
- Any cracker wannabes in the class?
HTH, BR,
Gudmund
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