[K12OSN] Where is the bottleneck?

Joseph Bishay joseph.bishay at gmail.com
Tue Jul 27 23:08:40 UTC 2010


How are you doing?  I hope all is well.

So I was recently informed by one of our staff that our LTSP
(k12Linux) system is too slow for youtube videos.  Not being a youtube
person (at least at work!) I had never really tried it so I gave it a
test now.

Server -> gigabit card -> gigabit switch -> gigabit client (Dell
Inspiron 530 - Core 2 Duo processor 1 GB RAM)

Ran the test when there was no one else logged into the network.  Gave
the Old Spice youtube video a whirl (
http://www.youtube.com/watch?v=owGykVbfgUE ) (ran it at 480p setting)
and it's horrible. It's not a video as much as a fast-flickering
slideshow.  Just to put it further I ran it at full-screen mode and it
looked more like a powerpoint slide presentation than a video.

I tried re-running the video several times, to see if having it in
memory/cache made a different but it didn't.

So I'm not sure what is the problem.  I recently purchased the gigabit
switch specifically to help speed things up but now I'm very worried.

What do you recommend I do in order to determine the location of the bottleneck?

thank you

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