Buffer Overrrun



I’m experiencing what looks like buffer overrun using the Q2438.
Basically I have a device that puts the Q2438 into “data mode” where you simply write to the UART and it passes it on to the TCP/IP socket.
The UART is running at 115200 but if I write about 8k of data at this speed I’m missing some at the other end.

Does anyone know the buffer size on the Q2438. What is the best strategy to maximize throughput using TCP/IP with the Q2438?