This is minor, but I’ll mention it because it might bite you someday: if you are using powerd to minimize CPU power usage, and also trying to push a high data rate through your serial port, you might drop characters. It’s mentioned in the powerd(8) man page, which has an entertaining bugs section.
A running description of activity related to DragonFly BSD.
This might happen if CPU frequency drops below *1.5GHz*.
Holy cow, that seems like a MAJOR bug.
It’s not like 1.5Ghz is a low number.