Performance tuning advice

[Martin Hess]

Hello,

I'm looking for advice on how best to tune Ubuntu Server 8.0.4 for  
best network performance. I have a custom server application that has  
up to 50,000 tcp connections open at a time.

The amount of data being sent is small -- on the order of a 3-4KB/min.
Connections come and go at a rate of 1000/minute.

Other considerations:
Disk I/O is unimportant.
Memory use is intensive.

Any thoughts?

Thanks,
Marty