Server requirements
From AssaultCube
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Machine requirements
CPU usage is not that much. But it is important, to provide sufficient priority to the server task, if it's not running alone on the machine. If the task suffers from high latency, ping time will increase.
Per player data amount
During normal gameplay, every player produces around 30 Bytes 25 times a second, or just 750 bytes/second. Special events, like new players connecting, may create peaks. Also, for example, every bullet increases the data amount a bit, so the actual values will vary for different game modes too. For example, tosok has almost no bullet data.
Server incoming bandwidth
For n players, the average incoming bandwidth will be n * 750 Bytes/second.
Server outgoing bandwidth
Every packet which is incoming from one player, is sent to all the other players.
For n players, the average outgoing bandwidth will be (n - 1) * n * 750 Bytes/second.
Though incoming bandwith scales linear with the player number, outgoing bandwidth increases quadratic with the number of players. For a doubled player count, quadruple outgoing bandwidth is needed.
Uplink bandwidth throttle
To share the uplink bandwidth fair between the players, a uplink throttle is provided. To limit the bandwidth usage of every single player, specify the maximum upstream data rate by using the -u commandline parameter. A player should have a throttle value of around (n - 1) * 750 Bytes/second. It's safe to set the throttle to line_uplink_capability / number_of_players
Example Calculation
given bandwidth
ADSL line with 6 mbps downlink and 384 kbps uplink:
n = sqrt((384000 / (8 * 750) + 0.25) + 0.5 = 8.52 -> up to 8 players
throttle = 384000 / (8 * 8) = 6000 -> use parameter -u6000
commandline parameters: -u6000 -c8
If the ADSL line is used for other purposes at the same time, the available bandwidth will be lower. Please do not host a server simultaneously to P2P networking or VoIP unless you can guarantee bandwidth by means of QoS. Playing AssaultCube on the same line is possible.
given player number
Server requirements for 16 players:
downlink = 16 * 750 * 8 = 96 kbps
uplink = 16 * 15 * 750 * 8 = 1440 kbps
throttle = 15 * 750 = 11250
rent a server with downlink > 96 kbps, uplink > 1440 kbps
commandline parameters: -u11250 -c16
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