@monstrocity
Hello,
we're very glad to see that the problem is resolved. 2048 packets make the output queue huge, but actually it is proportional to the amount of concurrent connections limit you have set in your torrent software. qBittorrent comes with a limit of 500 by default.
The other error you report pertains to a disconnection, unrelated to TCP_OVERFLOW. If you get such disconnections more often when you torrent, please warn us.
For the readers: overflow in the TCP output queue is a problem that does not exist in UDP.
Kind regards