[Freeciv-Dev] Re: (PR#2316) Reduce bandwith take 3

["Raimar Falke via RT" <rt@xxxxxxxxxxxxxx>]

On Tue, Nov 12, 2002 at 10:53:06AM -0800, Raimar Falke via RT wrote:
> The attached patch is a more or less rewrite of the freeciv network
> protocol. The protocol can be broken down into 3 layers:
>  - layer 1: defines how the data of each packet is transfered (how a
>  packet is serialized)
>  - layer 2: defines how packets are transfered (16bit size, 8bit type)
>  - layer 3: defines which packets are available to the user (PACKET_*
>  and struct packet_*)

And some numbers: I changed the code so that only the numbers of the
last turn is reported. The first line is the initial setup till the
first START_TURN.

Plain client:
2: turn=171; transmitted 132433 bytes in 7452 packets;average size per packet 
17 bytes
2: turn=172; transmitted 17262 bytes in 206 packets;average size per packet 83 
bytes
2: turn=173; transmitted 16064 bytes in 193 packets;average size per packet 83 
bytes
2: turn=174; transmitted 16590 bytes in 189 packets;average size per packet 87 
bytes
2: turn=175; transmitted 15030 bytes in 179 packets;average size per packet 83 
bytes
2: turn=176; transmitted 15583 bytes in 185 packets;average size per packet 84 
bytes
2: turn=177; transmitted 15993 bytes in 186 packets;average size per packet 85 
bytes
2: turn=178; transmitted 14443 bytes in 184 packets;average size per packet 78 
bytes

Delta:
2: turn=171; transmitted 91461 bytes in 4190 packets;average size per packet 21 
bytes
2: turn=172; transmitted 4367 bytes in 202 packets;average size per packet 21 
bytes
2: turn=173; transmitted 3035 bytes in 171 packets;average size per packet 17 
bytes
2: turn=174; transmitted 2641 bytes in 168 packets;average size per packet 15 
bytes
2: turn=175; transmitted 2169 bytes in 163 packets;average size per packet 13 
bytes
2: turn=176; transmitted 2351 bytes in 161 packets;average size per packet 14 
bytes
2: turn=177; transmitted 3165 bytes in 167 packets;average size per packet 18 
bytes
2: turn=178; transmitted 2076 bytes in 165 packets;average size per packet 12 
bytes

Looking at data for turn 172 in more detail:

Plain:
2: Transmitted packets:
2:   [ 2]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [ 3]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [ 5]:     81 packets;     2349 bytes total;    29 bytes/packet average 
PACKET_UNIT_INFO
2:   [ 8]:      1 packets;       11 bytes total;    11 bytes/packet average
2:   [ 9]:      4 packets;       36 bytes total;     9 bytes/packet average
2:   [13]:      7 packets;     3171 bytes total;   453 bytes/packet average 
PACKET_PLAYER_INFO
2:   [14]:      3 packets;     1992 bytes total;   664 bytes/packet average 
PACKET_GAME_INFO
2:   [16]:     24 packets;     1734 bytes total;    72 bytes/packet average 
PACKET_CHAT_MSG
2:   [17]:     78 packets;     7904 bytes total;   101 bytes/packet average 
PACKET_CITY_INFO
2:   [51]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [83]:      2 packets;       47 bytes total;    23 bytes/packet average
2:   [92]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [94]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [95]:      1 packets;        3 bytes total;     3 bytes/packet average
2: turn=172; transmitted 17262 bytes in 206 packets;average size per packet 83 
bytes

Delta:
2: Transmitted packets:
2:  Packets    Bytes  Byt/Pac Name
2:        5       15        3 PACKET_PROCESSING_STARTED(0)
2:        5       15        3 PACKET_PROCESSING_FINISHED(1)
2:        1        8        8 PACKET_NEW_YEAR(9)
2:        4       32        8 PACKET_TILE_INFO(10)
2:       24     1675       69 PACKET_CHAT_MSG(13)
2:       60      854       14 PACKET_CITY_INFO(15)
2:        2       14        7 PACKET_CITY_SHORT_INFO(16)
2:        7      114       16 PACKET_PLAYER_INFO(26)
2:       79      754        9 PACKET_UNIT_INFO(34)
2:        4       35        8 PACKET_PING_INFO(79)
2:        4       12        3 PACKET_CONN_PING(86)
2:        1        3        3 PACKET_BEFORE_NEW_YEAR(88)
2:        1        3        3 PACKET_START_TURN(89)
2:        1        3        3 PACKET_FREEZE_HINT(90)
2:        1        3        3 PACKET_THAW_HINT(91)
2:        3      827      275 PACKET_GAME_INFO(111)
2: turn=172; transmitted 4367 bytes in 202 packets;average size per packet 21 
bytes

Biggest part are the chat messages!!!!!. Lot of "Production upgraded
in" messages.

Lets take the next turn:

2: Transmitted packets:
2:   [ 2]:      2 packets;        6 bytes total;     3 bytes/packet average
2:   [ 3]:      2 packets;        6 bytes total;     3 bytes/packet average
2:   [ 5]:     78 packets;     2262 bytes total;    29 bytes/packet average
2:   [ 8]:      1 packets;       11 bytes total;    11 bytes/packet average
2:   [ 9]:      3 packets;       27 bytes total;     9 bytes/packet average
2:   [13]:      8 packets;     3624 bytes total;   453 bytes/packet average
2:   [14]:      2 packets;     1328 bytes total;   664 bytes/packet average
2:   [16]:     11 packets;      825 bytes total;    75 bytes/packet average
2:   [17]:     78 packets;     7904 bytes total;   101 bytes/packet average
2:   [51]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [83]:      2 packets;       47 bytes total;    23 bytes/packet average
2:   [87]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [92]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [94]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [95]:      1 packets;        3 bytes total;     3 bytes/packet average
2:   [96]:      1 packets;        9 bytes total;     9 bytes/packet average
2: turn=173; transmitted 16064 bytes in 193 packets;average size per packet 83 
bytes

2: Transmitted packets:
2:  Packets    Bytes  Byt/Pac Name
2:        1        3        3 PACKET_PROCESSING_STARTED(0)
2:        1        3        3 PACKET_PROCESSING_FINISHED(1)
2:        1        8        8 PACKET_NEW_YEAR(9)
2:        3       24        8 PACKET_TILE_INFO(10)
2:       12      854       71 PACKET_CHAT_MSG(13)
2:       60      804       13 PACKET_CITY_INFO(15)
2:        2       14        7 PACKET_CITY_SHORT_INFO(16)
2:        8      159       19 PACKET_PLAYER_INFO(26)
2:       76      727        9 PACKET_UNIT_INFO(34)
2:        1        3        3 PACKET_BEFORE_NEW_YEAR(88)
2:        1        3        3 PACKET_START_TURN(89)
2:        1        3        3 PACKET_FREEZE_HINT(90)
2:        1        3        3 PACKET_THAW_HINT(91)
2:        3      427      142 PACKET_GAME_INFO(111)
2: turn=173; transmitted 3035 bytes in 171 packets;average size per packet 17 
bytes

The city and unit info look at expected:

2: packet_city_info: sending info about (246)
2:   field 'food_stock' has changed
2:   field 'shield_stock' has changed
2:   field 'before_change_shields' has changed
2: packet_unit_info: sending info about (308)
2:   field 'activity' has changed
2:   field 'activity_count' has changed

Bottom line: you can reduce the startup bandwidth usage by 30% and the
in game by a factor of 4 to 7.

        Raimar

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