[K12OSN] Slow terminals

James P. Kinney III jkinney at localnetsolutions.com
Mon Aug 6 18:18:46 UTC 2007

On Mon, 2007-08-06 at 19:59 +0200, Nils Breunese wrote:
> James P. Kinney III wrote:
> > On Mon, 2007-08-06 at 13:38 -0400, "Terrell Prudé Jr." wrote:
> >> James P. Kinney III wrote:
> >>> Theoretically, a 1Gbit Nic _should_ handle about 700Mb/s using  
> >>> standard
> >>> ethernet (can't do jumbo frames in 100Mb). You are at the upper  
> >>> edge of
> >>> that limit with 54 clients running. Figure in at least 7Mb/s per  
> >>> client
> >>> just for resting state screen draws. If there is activity (all of  
> >>> the
> >>> games - childsplay, gcompris, tuxmath, tuxtype - are real  
> >>> bandwidth hogs
> >>> and can eat 20Mb/s for each instance).
> >>>
> >> In support of James's point here, TuxType will actually eat even
> >> more--as high as 73Mb/sec per instance.
> >
> > OUCH!! I have only clocked an aggregate and average. Since tuxtype and
> > tuxmath use the same engine I suspect they will be equivalent  
> > bandwidth
> > hogs.
> The bandwidth needed doesn't really depend on the things like  
> processing power and calculations. It's just the amount of on-screen  
> activity. Video and fast graphics take up a lot of bandwidth.

I have some of the nor-client Jr. machines. They will _NEVER_ be a
bandwidth hog. At 200MHz they are the bottleneck on the network :) which
is actually a good thing. It prevents any one student from being a
screen hog. Unless they are on a terminal window and running a custom
written system destroyer python application, those little clients will
not destroy the server in terms of load. If all they are supposed to be
doing is word processing, spreadsheets and a bit of web surfing, setting
the NIC to run at 10Mb will stop all sorts of student shenanigans...
> Nils Breunese.
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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>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
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