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dm6446 访问外部内存进行操作时,耗时异常增加



就这一小段代码,使用的内存都是外部内存, 当运算规模从96 * 72 变成128*128时, 理论上耗时应该变成原来的2.4倍左右, 但实际耗时就变成了原来的7,8倍,耗时为 783703(cycles),  这是什么原因导致的?求解, 谢谢?