I am using ARM embedded linux 2.6.30 on a samsung s3c2440. When I try to transfer bulk data (eg. a database) over serial port, I am getting speed of around 2-3 kbps. I am using a rs232 interface from my PC to the ARM development kit. The same code on PC to PC transfer gives me speed of 20kbps.
Is that the best speed I can get on an embedded platform. Can I do any to improve the performance, like mapping DMA channel for a UART or increasing the fifo size etc. etc.