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ddr cache 的问题



各位专家:据我看文档说ddr是默认不cache的,我加了

CACHE_enableCaching (128);
CACHE_enableCaching (129);
CACHE_enableCaching (130);
CACHE_enableCaching (131);

enable了48兆的ddr内存,但是运行的时间还是差不多,请问这是为何啊?