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关于C6657 PCIE速度上行速率

最近调试PCIE驱动,RC为海思linux,EP为6657,EP端内存映射到RC端,RC端发送数据到EP端,测得速度为680MB/s;但是RC端内存映射到EP端,从EP发送数据到RC,测得速度约为104MB/s,为什么这速度这么低,麻烦大家分析下,可能影响的原因。

谢!