[lug] 16550 Serial port buffering?
Scott A. Herod
herod at interact-tv.com
Thu May 24 15:30:03 MDT 2001
We're having a hard time getting rapid response from a clock attached
to the 16550 serial port on my machine. This is RH 7.1 with the
2.4.2 kernal. We believe that we're seeing a big delay ( on the order
of 10 msecs ) between the time the clock sends a byte and the
time that select in a user-land process returns with that byte.
A couple of questions:
Is this an indication of context switching and if so is it possible
to speed it up?
Is there a way to trigger another line on the serial port when the
read occurs so that I can watch a scope to verify that I am getting
Any other thoughts would be greatly appreciated.
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