[Mageia-dev] Proposal for Mageia: implement bitorrent protocol to allow updates download

Wed Jan 12 12:52:32 CET 2011

* andre999 (andr55 at laposte.net) wrote:
+> Romain d'Alverny a écrit :
+>>
+>> On Wed, Jan 12, 2011 at 04:29, Michael Scherer<misc at zarb.org>  wrote:
+>>
+>> However, if 1) was to open 5 connections on 5 distinct servers, that
+>> would make more sense, no?
+>
+> Right.
+> Another way to look at the question :
+> If 1000 people are downloading from mirrors allowing a total of 2000  
+> connexions, if no-one uses multiple connexions, then 1000 connexions are  
+> wasted.  These unused connexions would likely be from faster mirrors.
+
+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:
+http://distrib-coffee.ipsl.jussieu.fr/munin/distrib-coffee/distrib-coffee/index.html
+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 !
+
+> With aria2c, 3 mirrors which support a total of 5 connexions gives me  
+> optimal speed.  (The limit being the speed of my computer.)
+
+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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