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From: "Donald R. Oddy" <donald@grove.demon.co.uk>
Newsgroups: demon.ip.support,demon.tech.unix,comp.unix.bsd.freebsd.misc
Subject: Re: Batch FTP and Web Pages
Date: Wed, 10 Jul 96 23:38:54 GMT
Organization: Grove Systems Ltd.
Lines: 41
Message-ID: <837041934snz@grove.demon.co.uk>
References: <31D4AA3A.BC0@www.play-hookey.com> <31D87436.7C7F@www.play-hookey.com> <836295557snz@dsl.co.uk> <4rcr6v$dh@anorak.coverform.lan> <4rrs3s$i7s@cantina.clinet.fi>
Reply-To: donald@grove.demon.co.uk
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In article <4rrs3s$i7s@cantina.clinet.fi>
mickey@cantina.clinet.fi "Mika Ruohotie" writes:
>Brian Somers <brian@awfulhak.demon.co.uk> wrote:
>>So, what you're saying is that demon - who recently were applying for
>>another class B address space (about 65000 users currently?) have decided
>>in their infinite wisdom to invest in a T3? Well, bully for them. Let's
>>see, 45,000,000 bits / 65,000 users = 692 *bits* each. Woooooffff !
>>I'll get out there and start my 86 byte/sec download now ! Ok, maybe
>>that's a bit unfair. They havn't got the capacity to have everyone
>>connected at once. Let's say they allow 6000 of us in at once, what's
>>that, about 937 bytes per second ? In fact, this *wonderful* T3 will
>>allow a staggering 1607 28.8k users to get max throughput. I'd better
>>rush home and get in there first.
>
>why do i remember hearing about some statistical formula for counting the
>actual amount of users a specified bandwidth can handle...
>
>it was something about a cable being able to handle lot more people, with
>still full speed, than simple calculation would indicate...
>
>it was quite theoretical conversation and i read it on some local mailing
>list about two years ago... but the people who were talking about it are
>people who have been around the internet for like 20+ years...
>
>anyone knows what i'm talking about here?
I think you are referring to queueing theory which allows a calculation
to be made on the delay caused by bottlenecks. Originally designed for
calculating the number of cashiers needed in a supermarket it could be
used for determining how many of the 65,000 demon users would want to
be logged on at any one time and of those how many require how much US
bandwidth. To be of real use it requires quite a bit of information to
base the calculation on which Demon naturally keep confidential. It is
also only valid when there is a large enough number for a random pattern
to emerge.
--
Donald Oddy
Grove Systems Ltd. 0161-224 4465