HPS2FPGA Bridge Throughput

Hi,

I am working on a project where there is a DDR4 RAM connected to the HPS2FPGA bridge and the host sends data to be saved in the RAM. I am trying to improve the throughput from the HPS to the DDR4, but the fastest I have achieved is ~16MB/s.

The software is written in C and the system is running embedded Linux. I am using the mmap() function to write the data to the DDR4 RAM. The program just writes large chunks of data to RAM. I am using an array of memory mapped locations in the example, but the rate is the same with only one map.

numOfBytes = 0x1000000;
for(i = 0; i < 32; i++)
{
	ret = BridgeMap(HPS2FPGA, i * numOfBytes, numOfBytes, &ddr4Map[i]);
	ddr4Reg[i] = (unsigned int *) (ddr4Map[i]); 
	for(j = 0; j < numOfBytes/4; j++)
	{
		ddr4Reg[i][j] = i;
	}
}

int BridgeMap(int bridgeType, int address, int numOfBytes, void ** pMap)
{
	if(fd_bridge == -1)
	{
		return -1;
	}
	int bridgeOffset, pageAlignedAddress;
 
	if(bridgeType == LWBRIDGE)
		bridgeOffset = LWBRIDGE_START;
	else if(bridgeType == HPS2FPGA)
		bridgeOffset = HPS2FPGA_START;
 
	pageAlignedAddress = (address / 0x1000) * 0x1000; // get page aligned address
	*pMap = mmap(NULL, numOfBytes, PROT_READ | PROT_WRITE, MAP_SHARED, 
			   fd_bridge,  bridgeOffset + pageAlignedAddress);
	if(pMap  == MAP_FAILED)
	{
		printf("error mapping: %s\n",strerror(errno));
		return -1;
	}
 
	return pageAlignedAddress; 
}

How can I improve the data rate going from the HPS to RAM? Is there a better way to communicate data from the HPS through the HPS2FPGA bridge? Should I be using the F2SDRAM bridge instead?

Thank you