Uploading from University
(posted by Fred Emmott at 2007-10-04 11:01:32)
Yesterday, Lamby saw me going to the CS department to upload Slamd64 updates, and asked if I knew what the effective bandwidth was, including the cycle trip. He also has since made a nice graph :) Unfortunately, it's not quite right for me, as my housemates get rather annoyed if I completely saturate the upstream, and only considered one leg of the journey, and it's a round trip, so here's my version of the graph plotting time to upload stuff to anorien from home and university, including cycle trip:
For those that care, I've also put up the gnuplot file.
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re: inaccurate
Posted at 2007-10-04 14:31:54 GMT +0000 by "Fred Emmott" (
http://fredemmott.co.uk/)
Hi; where'd you get "40 minutes" from? Also, I'm confused by "flat" - the Y axis is time.
re: inaccurate
Posted at 2007-10-04 14:35:20 GMT +0000 by "Fred Emmott" ( http://fredemmott.co.uk/)
Also, the X axis is MB, not MB/s
re: inaccurate
Posted at 2007-10-04 18:25:32 GMT +0000 by "sebas"
Well, my post was a bit inaccurate. Basically, the amount of data transferred doesn't change for the first 25 minutes in the cycle case. Then it is a steady 8 MB/s at which point it actually gets closer to the amount of data transferred by your home line and at some point exceeds it. The amount of time needed to cycle home does not make a difference for the bandwidth, since the transfer can go on, or is finished, but you don't need to count that. The point is that your just not transferring any data while cycling, which isn't reflected well in the graph. (That would be the fixed cost part then.)
dodgy graph...
Posted at 2007-10-07 18:31:56 GMT +0000 by "Ed"
should have time along the X axis
Really, the graph is (almost) fine
Posted at 2007-10-10 10:42:56 GMT +0000 by "Rupert"
Basically, the x-axis is bandwidth, so as pointed out above it should be MB/s. However, otherwise this all makes perfect sense. My only question would be about occasional network failures on campus - do you have to take some sort of expectation with high bandwidth 99% of the time and 0 for the other 1% ? :)
Noooooooooooo
Posted at 2007-10-11 14:21:40 GMT +0000 by "Fred Emmott" ( http://fredemmott.co.uk/)
The X axis is *NOT* bandwidth. "MB" is correct. "MB/s" is not. This graph shows how long it takes to upload "x" MB of data.
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inaccurate
Posted at 2007-10-04 14:02:49 GMT +0000 by "sebas"
Actually, the university graph should be flat for fourty minutes and then rise at the upload speed. This way, it's not representative, if I get it right. The computation should basically be the same as usual accounting does with fixed and variable costs, and the breakeven point.