Buffer overrun on Fedora 16 serial

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http://unix.stackexchange.com – I got a brain smashing problem with Fedora 16 and my serial port. I use the serial to monitor an STB on which I'm developping. The STB runs on Linux and when booted, I launch the program I'm working on through the serial interface. Now, my program outputs lots of traces when I'm debugging, and I get loads of buffer overrun errors in dmesg. This makes debugging the application a mess, because the serial output gets unreadable. So, what's bothering me is that when I was running on Fedora 15, there was no buffer overrun at all! Some more details on my setup: Fedora Core 16 under Cinnamon / (HowTos)