How to improve Ethernet transmission speed？

Hello,

Sorry for misunderstanding your meaning. I downloaded the GHRD project for Cyclone V from Rocketboards and made modifications based on GHRD. On the FPGA side, I used FIFO and SGDMA IPs, but on the HPS side, I did not use IP. I did not use Ethernet IP, just wrote code on the HPS side to read the data in DDR3 and send it through the sendData function.

Thanks.

//main code
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "sgdma_dispatcher.h"
#include "sgdma_dispatcher_regs.h"
#include "ethernet_sender.h"

#define DISPATCHER_CSR_BASEADDR_W 0xC0001000
#define DISPATCHER_DESC_BASEADDR_W 0xC0002000
#define DISPATCHER_CSR_BASEADDR_R 0xC0003000
#define DISPATCHER_DESC_BASEADDR_R 0xC0004000

#define HPS_MEM_STORE_STARTADDR 0x10000000

#define FRAME_WIDTH 1280
#define FRAME_HEIGHT 720
#define PIXEL_FRAME 14
#define PIXEL_SIZE 2
#define FRAME_SIZE (FRAME_WIDTH * FRAME_HEIGHT * PIXEL_FRAME * PIXEL_SIZE)

int main(int argc, char* argv[]) {
    int mem_fd = open("/dev/mem", O_RDWR | O_SYNC);
    if (mem_fd == -1) {
        perror("Error opening /dev/mem");
        return -1;
    }

    // Map the HPS DDR3 memory region to user space
    uint8_t* data = (uint8_t*)mmap(NULL, 0x2FFFFFFF, PROT_READ, MAP_SHARED, mem_fd, HPS_MEM_STORE_STARTADDR);
    if (data == MAP_FAILED) {
        perror("Error mapping DDR3 memory");
        close(mem_fd);
        return -1;
    }

    // Create dispatcher control
    tcSGDMADispatcher write_dispatcher(DISPATCHER_CSR_BASEADDR_W, DISPATCHER_DESC_BASEADDR_W, 0);

    // Create descriptors
    tsSGDMADescriptor write_descriptor = {0};

   
 while (1) {

        
        write_descriptor.write_addr = HPS_MEM_STORE_STARTADDR;
        write_descriptor.length = FRAME_SIZE;
        write_descriptor.control.msBits.end_on_eop = 1;
        write_descriptor.control.msBits.go = 1;

        write_dispatcher.WriteDescriptor(write_descriptor);   

        sendData(data, FRAME_SIZE, "192.168.137.1", 12345); 
      

     }

    // Unmap the DDR3 memory region and close /dev/mem
    munmap(data, 0x2FFFFFFF);
    close(mem_fd);

    return 0;
}

Hello,

Sorry, I'm not sure how to measure the bandwidth of SGDMA. I will describe the complete process of data movement to you.

The data is output by video sensors with a resolution of 1280x720@56fps and the format is RGB565. Afterwards, the data is sent to FIFO, then to DDR3 through SGDMA, and finally to PC using the sendData function on the HPS side. The receiving rate measured on the PC side is about 350Mbps, and I have tried using Wireshark to capture packets, but there was no data loss. I am sure the Ethernet connection speed is 1Gbps.

I have also tried sending data directly from HPS to PC, and the fastest speed can reach 750Mbps. However, when sending video data from FPGA, the speed drops to 350Mbps. By the way, I use a CAT5E network cable.

The video sensor is driven by an internal clock, with a frequency of 145.6 MHz and a data width of 8 bits.

Thanks for your patient help.

Regards.

Hello,

Thanks for your help.

Sorry, I sent video data instead of image data. And my video resolution is 1280x720@60fps.

Best regards.

Hello Zying,

I use the Cyclone V board to send data to the PC, and the IP address of the board is 192.168.137.245, while the IP address of the PC is 192.168.137.1.

Thanks.