3 Replies Latest reply on Jun 28, 2012 6:41 PM by yurtesen

    High memory latency for memory copy between host and devcie

    sunny_engineer

      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