Increase TCP packet sending speed

Joe von Habsburg

hello, I am sending a file with tcp but the maximum I can see is 50Mbps. when I send the same file with a short code in python, I can see 300Mbps. how can I increase this file sending speed?

void FileTransfer::sendFile(QString path)
{
    qDebug() << "FileTransfer::sendFile" << path;

    if(!_client->isOpen()){
        return;
    }

    QFile file(path);
    if(!file.open(QIODevice::ReadOnly)){
        return;
    }

    QFileInfo fileInfo(file);
    QString FileNameWithExt(fileInfo.fileName());
    qint64 len;
    while (!file.atEnd()) {
        QByteArray fileData = file.readAll();
        len = _client->write(fileData, fileData.size());
    }

    QString msg = "File has been sent : " + FileNameWithExt+ "\nFile Size : " + QString::number(file.size());
    emit sendResponses(msg, len);
}

also it tells me here that it has sent the file but the other party has not received it yet. why could that be?

Axel Spoerl

Which class is _client, which version of Qt are you using on which OS, which is the Python code?

Joe von Habsburg

@Axel-Spoerl said in Increase TCP packet sending speed:

Which class is _client,

its, QTcpSocket

@Axel-Spoerl said in Increase TCP packet sending speed:

which version of Qt

qt6.6

@Axel-Spoerl said in Increase TCP packet sending speed:

which is the Python code?

import socket
import struct

def send_file(host, port, file_path):
    try:
        client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        client_socket.connect((host, port))
        
        with open(file_path, "rb") as file:
            while chunk := file.read(1024): 
                client_socket.sendall(chunk)
        
        client_socket.close()
    except Exception as e:
        print(f"error: {e}")


HOST = "192.168.1.10"
PORT = 5001 
FILE_PATH = "plus_45.bin"  

send_file(HOST, PORT, FILE_PATH)

Christian Ehrlicher

How large is the file? When it's very large - with Qt you load it into memory at once and then copy it again, with python you send it in chunks