Before revision:  We prove that the average response time in GI/GI/1 scales with 1/(1-\rho), if the job size distribution has finite support, which generalizes the growth rate in Lin, Wierman and Zwart, 2011 to general arrival processes and all work-conserving algorithms .
After revision:  We prove that the average response time in GI/GI/1 scales with 1/(1-\rho), if the job size distribution has finite support, which generalizes the growth rate in Lin, Wierman and Zwart, 2011 finite task workload .