[BitTorrent] BT repeater?

Bill Cox bill at viasic.com
Mon Dec 13 09:30:46 EST 2004


On Mon, 2004-12-13 at 08:52 +0100, Olaf van der Spek wrote:
> >> > A slave repeater directly increases your normal BT clients download 
> >> > rate
> >> > by about 50% per repeater.  If you run one, and it gets other slave
> >> > friends, they could help you download anything at any time at your max
> >> > download speed, not your upload speed.  There's really no down-side.
> >>
> >> The downside is that it costs more bandwidth.
> >
> > A slave repeater could stop helping other slaves when it's helped them
> > download some predetermined amount of data.  After that, it just helps
> > out enough to know that it should be able to get that much back at some
> > time in the future.  So, the total upload/download ratio remains around
> > 1:1.  You only pay for about as much upload bandwidth as you download.
> > But, you get the download bandwidth when you need it, not limited by
> > your upload bandwidth.
> 
> If from the outside, your ratio is 1:1, then each slave uploaded on average 
> the same as it downloaden to the 'world'.
> But that means the data is not yet at the master.
> So transfering that data to the master is the extra bandwidth (cost). 

Ah, you are correct.  To get a gigabyte of credit with other slaves, a
slave would have to download 1G, and upload 2G.  Later, in the best
case, it could get other slaves to return the 1G of bandwidth on demand
to the master, which only costs the master the download bandwidth.  In
total, for the master to get the data, there was 2G of download, and 1G
of upload, plus a small amount of overhead.

Bill




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