Re: [LARTC] Theory test

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Kenneth Kalmer wrote:
> Guys
> 
> Considering the festive season is upon us, thanks to everyone
> contributing to the list and helping all the readers with your great
> input! I don't want to mention names, I'll most certainly leave
> someone out.
> 
> With this mail I'd like to test some theory on bandwidth management,
> with my own successes and failures during the past year.
> 
> Sharing a link between 200 users
> 
> This has probably been my worst headache this year, since all the
> trials go well but the implementation doesn't run as expected. So here
> goes. We have one connection that is shared by 200 users. Mostly
> students, so abuse is rampant. Each user should have an upper-limit
> for speed, but the upper limit times the number of users exceed the
> link capacity (over subscription). The speed must degrade as more and
> more users are online, so that in peak times the link must still be
> usable for each and every user, even if dreadfully slow.
> 
> Here is the implementation in theory:
> Total internet capacity: X
> Total number of users: 200
> Minimum transfer rates: Y = X / 200
> Maximum transfer rates: Z = 8 * Y
> Over subscription rate: 1:50

Are we talking about ingress or egress?

How much bandwidth do you have (and how much are you sacrificing)?

What are the lengths of queues for each user?

What is the link DSL/other?

Andy.
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