[K12OSN] More feedback on Fedora 10 + LTSP

Warren Togami wtogami at redhat.com
Tue Apr 28 05:22:09 UTC 2009

On 04/27/2009 09:23 PM, David Hopkins wrote:
> Actually I can't make a claim either way since right now I'm confused
> about just how much throughput I am getting without ltspbr0 even
> present.  I install iftop as well as ntop and have tried launching
> tuxmath on several thin clients simultaneously.

Where do you find tuxmath?  It seems it isn't in Fedora 11 at least.

> For iftop: The first thin client used appr 38Mb/s just to bring up the
> menu. When running, it was using appr 70Mb/s for the game.  The second
> client likewise used appr 38Mb/s for the menu. However, the moment I
> selected an option from the menu, both instances dropped to around
> 56Mb/s.  When I added a third client, this dropped again, into the mid
> 30Mb/s range.  The total throughput stayed constant at around 110Mb/s.
>   However, even at 3 clients, the game was not playable (it was very
> very slow).  I continued adding clients and iftop continued to report
> that the max stayed around 110Mb/s but the bandwidth for each client
> dropped with each addition.  At six clients, it was about 18Mb/s per
> client.

Does tuxmath normally use that insane amount of bandwidth?  70Mb/sec is 
comparable to 320x240 30fps Youtube video.  Absolutely nothing other 
than video in my experience using anything near that amount of bandwidth.

> However, the switch still showed that the link between it and the
> server was 1000Mb/s.  So .. why is only about 1/10 of the bandwidth
> being used as far as iftop is concerned?

I have never used iftop before this, so I don't know how good it is.


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