[K12OSN] Testing actual network speeds

john lists.john at gmail.com
Fri Dec 29 13:32:54 UTC 2006

Hi Carl,

1. Whats your memory usage look like when some of your clients aren't
repainting very well?
2. Whats your CPU usage look like when some of your clients aren't
repainting very well?
3. Make sure you have a gigabit card on the server going to that gigabit
switch so that the servers nic isn't the bottleneck.

For general network testing you could look at iperf
Basically it has two parts, a server and a client. You install the server,
which listens on a high port, and you use the client to send it chunks of
data. I don't know that this would be informative on a k12ltsp setup, but
you could always put a stand along machine in the mix and run the iperf
client from there.


On 12/28/06, Carl Keil <carl at snarlnet.com> wrote:
> Hi Folks,
> Can anyone suggest a way to test my LAN speeds that I'm using for
> K12LTSP?  Screen redraws are jerky and slow on some of my clients.  I've
> always suspected my network cabling wasn't quite right, but I don't know
> how to test it.  When I request things from the web server on the
> network and other network activities where I can "get a reading" of the
> transfer speed it's usually about 30Mb/s.  Which seems a little on the
> low side.  But that's not even my K12LTSP network, I don't know how to
> test the speed between server and client.  Clearly it's working at
> 100BaseT, but it seems like there's got to be a bottleneck somewhere.
> I'm using a consumer grade 1000BaseT switch for my thin client network
> and I think it's helped some with having multiple clients going at the
> same time, but I can't help thinking that each client could be doing
> better?
> How do you folks test your network cabling?  Is there a device in the
> $100 range that might help?  Can I run wireshark (or similar) on the
> server and see what's going on with the clients?  How would I set that up?
> Thanks,
> ck
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