Before revision:  In this paper we study the value of the mean response time E[ R _\lambda] as the arrival rate \lambda approaches 1  (i.e. the system gets close to instability).
After revision:  In this paper we study the value of the mean response time E[ R _\lambda] as the arrival rate \lambda approaches 1 for a number of load balancing policies when job sizes are exponential with mean 1 (i.e. the system gets close to instability).