[Bug 240121] Serial console can eat a lot of CPU with low baudrate

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240121

--- Comment #2 from Alexander Motin <mav at FreeBSD.org> ---
That effect is unexpected to me.  I would expect opposite -- reduction of wait
time, since code reduces number of buffer flushes and utilizes hardware FIFO. 
I may need to reproduce it to understand the issue.

What UART hardware are you using?  Does it have FIFO?

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