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C6455 的CACHE CSL参数设置问题



CACHE_setL1pSize(CACHE_L1_32KCACHE); 
CACHE_setL1dSize(CACHE_L1_32KCACHE);
/* make sure that L2 cache is turned off */
CACHE_setL2Size(CACHE_0KCACHE); 

请教下,以上几句代码对于L1 和L2的设置语句具体有什么用处,文档哪里有介绍呢,这些参数的设置对程序运行效率有具体影响吗。