Before revision:  We further consider the problem under Poisson arrival and general workload distribution ,\ie and show that M-SRPT is asymptotic optimal when the traffic intensity \rho approaches 1, if the job size distribution has bounded support.
After revision:  We further consider the problem under Poisson arrival and general workload distribution ,\ie and show that M-SRPT achieves asymptotic optimal mean response time when the traffic intensity \rho approaches 1, if the job size distribution has bounded support.