More on bittorrent
akonstam at sbcglobal.net
Mon Feb 26 21:32:56 UTC 2007
On Mon, 2007-02-26 at 10:30 -0800, Kam Leo wrote:
> On 2/26/07, Aaron Konstam <akonstam at sbcglobal.net> 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
So am I conclude that >10 hours may be what it will take. How do oyu
find out how many seeders are active?
The race is not always to the swift, nor the battle to the strong, but
that's the way to bet. -- Damon Runyon
Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam at sbcglobal.net
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