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AM3354: SD卡和USB存储设备读写速率低。

Part Number: AM3354


linux内核版本4.19.38.

系统采用的是ubuntu16.04.

目前测试采用dd命令对U盘和SD卡(SDIO接口) 进行读写操作,发现读写速率低,请问一下这个是什么原因造成的,需要怎样排查。请教各位大神出招。

下面是测试的结果