xdma shell with xrt performance question

[anonymous1782]

Hi,

I am using xdma shell to interact between host and card. Unfortunately, I can not achieve the expected dma performance for write.

While read bandwidth almost saturate the PCIe bandwidth, write bandwidth does not.

1. What is an error here and how can I correct it?

Thanks

$ xbutil validate -d b3:00.1 -r 'dma'
Starting validation for 1 devices
 
Validate Device           : [0000:b3:00.1]
    Platform              : xilinx_u200_gen3x16_xdma_base_1
-------------------------------------------------------------------------------
Test 1 [0000:1a:00.1]     : DMA
    Details               : Host -> PCIe -> FPGA write bandwidth = 9302.8 MB/s
                            Host <- PCIe <- FPGA read bandwidth = 11909.4 MB/s
    Test Status           : [PASSED]
-------------------------------------------------------------------------------