Nat load balancing with weights?

[Conrad Burger]

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Hi 

I am currently using the pf nat round robin functionality to load balance tcp
connections to 3 servers.

This works great! Currently load balancing about 32000 connections concurrently.

The 3 systems have different hardware specs and currently 2 of the systems are
running at 100%. 
We will be adding more servers, but doing symmetrical load balancing to
non-symmetrical CPU hardware platforms is becoming a major problem.

Is it possible to configure pf to do non-symmetrical load balancing where a per
system connection ratio can be defined?

Are there any other technologies running on FreeBSD that will perform this task?

Regards 
Conrad Burger