how to limit pps and connections?

Hello i know that was several times here but besides simple formula for firewall (but You can write it here) i want to ask how many connections and pps give to clients in.

  1. 256k/56k
  2. 512k/96k
  3. 1024k/128k
  4. 2048k/256k

any ideas? i have bad dsl conn with 8M/1M and it dies around 600 pps both directions.

Prioritize your TCP ACK Packets.