Abstract: Fetch policy influences instuction throughput rate of computer processor directly. In the view of the shortages of unbalaned utilization of fetch bandwidth and high conflict rate of instruction queue, a new fetch policy named instruction flow speed based on simultaneous multithreading(IFSBSMT for short) was proposed. This strategy fetch takes the value of instrunctions per clock(IPC) to select the high priority thread and the method of prefetch instructions number to allocate fetch width. Meanwhile, IPC value for thread and L2 Cache miss rate are taken as the dual priority dynamic resource allocation mechanism to allocate the system resource for processors. hhe result shows IFSBMT can effectively improve the instruction fetch bandwidth and overcome the problems of instruction queue and resources waste, which can improve instruction throughput and abtain a better fetch fairness.

Key words: Simultaneous multithrcading,Fetching stratcgy,IFSBSMT,Fetch bandwidth,Instruction queue conflict,Dual priority dynamic resource allocation