Traffic Partitioning for Different Customers

Let's say you have different customer that you are load balancing service traffics for, customer A uses SSL traffics and customer B uses only HTTP plain traffic. Assume you have a pair of f5 chassis with xyz ammount of traffic handling capacity. How can you ensure that Cust_A does not impact Cust-B traffics. i-e how to separate these two type of traffics based on the capacity of the chassis f5 box so that if Cust-A is handling lots of SSL traffics (which could cause the big-ip to go high in CPU) that is does not affect Cust_B's service performance.