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High memory latency for memory copy between host and devcie

Question asked by sunny_engineer on Jun 16, 2012
Latest reply on Jun 28, 2012 by yurtesen

Hey,

 

I was trying to measure the bandwidth for the data transfers on AMD Fusion A8-3850 and I though that because of the absence of the discrete GPU, there is no cost of PCIe. So I was expecting to have very high bandwidth as compared to the numbers on a discrete GPU device. But I got these numbers for the fusion

 

pinned: H_to_D (4.9GB/s) D_to_D (16GB/s)

page-able: H_to_D (3.8GB/s) D_to_D (16GB/s)

 

and these one for the NVIDIA GPU

 

pinned: H_to_D (5.5GB/s) D_to_D (20GB/s)

page-able: H_to_D (4.1GB/s) D_to_D (20GB/s)

 

Is my understanding wrong or am I missing something here??

 

Thanks


Shoaib

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