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<H1>[Mageia-dev] Proposal for Mageia: implement bitorrent protocol to allow updates download</H1>
<B>Olivier Thauvin</B>
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TITLE="[Mageia-dev] Proposal for Mageia: implement bitorrent protocol to allow updates download">nanardon at nanardon.zarb.org
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<I>Wed Jan 12 12:52:32 CET 2011</I>
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<PRE>* andre999 (<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">andr55 at laposte.net</A>) wrote:
><i> Romain d'Alverny a écrit :
</I>>><i>
</I>>><i> On Wed, Jan 12, 2011 at 04:29, Michael Scherer<<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">misc at zarb.org</A>> wrote:
</I>>><i>
</I>>><i> However, if 1) was to open 5 connections on 5 distinct servers, that
</I>>><i> would make more sense, no?
</I>><i>
</I>><i> Right.
</I>><i> Another way to look at the question :
</I>><i> If 1000 people are downloading from mirrors allowing a total of 2000
</I>><i> connexions, if no-one uses multiple connexions, then 1000 connexions are
</I>><i> wasted. These unused connexions would likely be from faster mirrors.
</I>
The upload given by a serveur is split in term of:
- connection available
- bandwidth available.
If the mirrors is connected to Gb (which is more likelly the size of
bandwidth for the whole university...), and you split this Gb/s onto
2000 connection you obtain 500kb/s.
However, I know only few server in the world really able to read Gb/s
from their disk. The top rate I obtain on dc is 400mbis/s (the memory
cache help a lot to obtain more).
The number of connection is set high because some people download at
only 50kb/s and other 2Mbit/s, so the spare bandwidth from the 50kb/s
can be given to others. Nothing more.
According the graph on distrib-coffee:
<A HREF="http://distrib-coffee.ipsl.jussieu.fr/munin/distrib-coffee/distrib-coffee/index.html">http://distrib-coffee.ipsl.jussieu.fr/munin/distrib-coffee/distrib-coffee/index.html</A>
there is an average of 100 http download at a time, if each connection
become 5 (500), you'll reach the limit (200 on this server).
What will be the gain on your side ?
I talked here only about http, but apply the same to ftp in the same
internet connection, so it mean I have 100mbits/s to share between 400
connections.
As Mickael explain, I voluntary limit the count of connection per IP,
before I did this, the server was overload 12 hour a day, which mean
stop serving !
><i> With aria2c, 3 mirrors which support a total of 5 connexions gives me
</I>><i> optimal speed. (The limit being the speed of my computer.)
</I>
Can we know the speed of your connection ?
Maybe your connection is good enough to provide a mirror for Mageia ?
And then you'll be able to test what you're suggesting.
What is the result with 5 mirrors and 1 connection per mirror ?
Obviously, any mirror in France (I am in France) is able to fulfill
my personnal connection... (10mbits/s).
--
Olivier Thauvin
CNRS - LATMOS
♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖
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