[K12OSN] LTSP Lab Slow to Boot

James P. Kinney III jkinney at localnetsolutions.com
Sat Sep 13 01:26:53 UTC 2008

Based on the studies I and others have done, a 100Mb line from the
server to the clients will support up to 10 clients _at_idle_. The
bandwidth of a live X connection is simply too high to support more. You
can do about 70 on a single Gb line. Each TC eats about 7Mb for an idle
connection. Load up Firefox with flash on a web page or a big
heavyweight like Gcompris of TuxMath and the bandwidth soars to 50-70 Mb

Now add to this that the connection between each client and the server
is fully encrypted. The encryption adds to the load about an additional
5-8% plus a pile of CPU overhead on both ends.

You need to use Gb NIC(s) on the server and a switch with a Gbit port
for each Gbit NIC on the server. Then you can do NIC bonding and get
some bandwidth downstream. If you get a managed switch, look for 802.3ad
capability as that is hardware support for link aggregation (joins 2 or
more ports to make a FAST pipe!). Otherwise use bonding mode 4 or 5
(which is switch independent).

On Fri, 2008-09-05 at 12:52 -0400, Crampton, Stephen C. wrote:
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James P. Kinney III          
CEO & Director of Engineering 
Local Net Solutions,LLC                           

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
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