摘要:
In a multiprocessor system, a system controller includes snoop tags which are copy information on cache tags retained by respective CPUs. If the same address is registered in S (Shared state) in the cache tag of each of the CPUs connected to the same CPU bus, the address is registered in S (Shared state) in only any one of the snoop tags corresponding to the CPUs in which the same address is registered.
摘要:
In an information processing system loaded with a CPU (104, 2a, 2b) having cache and a system controller (101, 1) having a copy of a tag (105, 3a, 3b) of the cache (snoop tag) (102, 5a, 5b), and the CPU not issuing replacement information about the cache tag (105, 3a, 3b), the number of WAYs (103, 5a-0 - 5a-4, 5b-0 - 5b-4) of the snoop tags in the system controller is larger than the number of WAYs (106, 3a-0 - 3a-3, 3b-0 - 3b-3) of the cache tags in the CPU to reduce a cache miss rate and suppress the degradation of performance by suppressing excess replacement of the cache tags in the CPU.
摘要:
In an information processing system loaded with a CPU (104, 2a, 2b) having cache and a system controller (101, 1) having a copy of a tag (105, 3a, 3b) of the cache (snoop tag) (102, 5a, 5b), and the CPU not issuing replacement information about the cache tag (105, 3a, 3b), the number of WAYs (103, 5a-0 - 5a-4, 5b-0 - 5b-4) of the snoop tags in the system controller is larger than the number of WAYs (106, 3a-0 - 3a-3, 3b-0 - 3b-3) of the cache tags in the CPU to reduce a cache miss rate and suppress the degradation of performance by suppressing excess replacement of the cache tags in the CPU.