Re: More on bittorrent

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On 2/26/07, Aaron Konstam <[email protected]> wrote:
>>
>>Aaron Konstam wrote:
>> I wanted to download the latest FC6 respin CDs. I went to the web
>> location and found the correct bittorrent and clicked to download it.
>> The bittorrent GUI opened and the download started. Now I was
connected
>> to a system with an Internet speed of 45 Mb/s but the GUI said the
>> download would take 15 hours. Well the respin has 5 CDs. I have a
>> downloaded a single 600+ Meg CD in less than an hour (actually I
think
>> it was much less). So I can't understand why the bittorrent download
>> should take 15 hours.
>>
>> I have done this before but it has been a long time ago. I must be
doing
>> something wrong but what? Any ideas?
>
>A couple of things to check - do you have a download speed limit
>set, so that it does not use the full bandwidth when downloading? Do
>you have your firewall properly configured so that you can seed as
>well as download? If not, this can limit your download speed. How
>many seeds are there, compared to the number of clients, and how
>many are you connected to?
My download speed was set too high. I have no firewall set on my machine
but the university does however they tell me that they do not restrict
bittorrents. I don't know how to check the number of seeds and /or
number of clients.

So there are clearly holes in my knowledge. Can someone help fill in the
gaps.
>
>One other thing to keep in mind is that the time estimate when you
>first start downloading is usually high, and drops as you connect to
>more feeds. It also tends to change during the download. Depending
>on how the client calculates the time remaining, it may get less
>sensitive to rate changes as the download progresses - more data to
>average, so temporary fluctuations in download speed do not affect
>it as much.
The above is true but I waited 2 hours and not even 1 CD was downloaded.

Bittorrent works when there are a large number of seeders and peers.
The problem with the Fedora respin is that after the initial
availability announcement the number of seeders and peers drops to a
very low number, less than 5 when I tried it. If each shares the
minimum required upload speed, 4K bits/second, the total bandwidth is
only 20K bits/second. Factor the low number of participants and the
problem of finding peers with the fragments missing from your download
and you get the current situation. Also I find that the tracker used
by Fedora respin does not work well with my setup which is behind a
firewall.


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