On 27/05/2011 14:02, Jacob Broussard wrote:
I don't use almost any bandwidth outside of Netflix, Steam game
downloads, and getting my daily dose of streaming starcraft videos and
ntop tells me I averaged 1.7mbps over the last month. Mind you this
is on an 8mbps peak connection. With peak speeds of 8m I would be
pissed if I was getting 500k, much less if I had a 100m connection and
got less than a meg. I have no doubt that if I had a faster
connection that I would have used even more bandwidth... With the
popularity of streaming video now a 1000:1 or even a 100:1
oversubscription rate is almost definitely just going to cause you
headaches... Back in my days of noc, 9 out of 10 bandwidth AUP
abusers weren't even using torrents, they were almost all netflix or
people that got rid of cable to watch video online.
I suspect your average usage is an order of magnitude higher than that
of the 'average' user.
This is one of the effects that makes it hard for me to imagine the
traffic profile, as my own usage patterns (and those of my circle of
friends) is not what one would call typical.
For example if 300KB/sec average peak holds true with only 1000 users,
that's only 300Mbit usage, giving 700Mbit headroom. I suspect this will
only become true with 10000 users on 10G though, and that 1G links will
be much more bursty as a single customer can push 10% of the backhaul speed.
Remeber that 1000:1 contention *doesn't* mean that you only get 1000th
of the backhaul speed, it means the *peak average* usage of all users
should be under 1Mbit. Your peak is most likely 8Mbit, but there are
probably 40 users who use very liuttle for every one of you, and they
may only double the peak average to 16mbit, thereby giving a much lower
peak average for all 41 of you (if you see what i mean?)
I suck at maths, and I'm pretty sure I was at home playing Tekken 2 when
I should have been in statistics class :)
adam.
