[Freeciv-Dev] Bandwidth

[Raimar Falke <hawk@xxxxxxxxxxxxxxxxxxxxxxx>]

Based on the data I got from Thomas Strub it is possible to calculate
the overhead of the recent request id changes:

2: transmitted 134157 bytes in 5020 packets;average size per packet 26 bytes
2: received 11512355 bytes in 277000 packets;average size per packet 41 bytes

total bandwidth=a=134157+11512355=11646512
request id overhead=b=6 bytes/request * 5020 requests=30120
relative overhead=a/(a-b)=1.00259288=0.26%

I have also instrumented the tile_info packets. The results are
frightening. In a normal game starting from scratch:

2: all=2800 new=1164 changed=1494 {type=0, special=36, known=1458} no-change=142

In a loaded game
<http://civserver.freeciv.org/games/21679/civgame.sav.gz>, just after
the game ist started:

2: all=8000 new=4000 changed=0 {type=0, special=0, known=0} no-change=4000

So the whole map is sent twice!

After pressing 9 times the next year button:

2: all=100000 new=4000 changed=125 {type=3, special=54, known=68} 
no-change=95875

So 95% percent of the tile_info packets sent to the client provide the
client with no extra information.

        Raimar

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 email: rf13@xxxxxxxxxxxxxxxxx
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