How to avoid excessive UDP packet loss -- for your information

[serdef]

Hello,

my application suffered from udp packet loss at busy moments.
Of course udp is not reliable, I know, but it lost many packets
that wireshark did see arrive on my pc.

I found a simple solution for that, within qt :
Since QT5.3, you can set this socket option : QAbstractSocket::ReceiveBufferSizeSocketOption
I updated to QT5.3, and set the OS socket receive buffer to a huge 2M bytes :
This solved the packet loss, the default receive buffer is probably quite small.
See code below.

...
socket->bind(QHostAddress::Any,portnr);
socket->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption,2000000);
connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
...

[sierdzio]

Oh my, if I had found that out 2 months ago, it would have spared me some huge refactoring...

anyway, this is a great find, thanks a lot for sharing.