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DE4 DMA read/write performance via PCIe

Honored Contributor II

Hi all,  


I have modified the design in Using PCI Express on DE4 boards tutorial to test the performance of DMA Reads/Writes. What I did is simply replace the nios II processor and onchip memory to a FIFO with avalon MM slave interface. However, the speed I got is relatively low compared to the one mentioned in the PCIe High performance reference design (only about 100MB/s read/write for gen1 x4 compared to 875MB/s read and 890MB/s write).  


I am wondering if anyone has done a similar testing as well and how's your performance? Could I have a look at your design and code if possible? Thanks. 


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