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Date: Mon, 5 Feb 1996 21:53:42 -0700
From: Kurt Olsen <kurto@tiny.mcs.usu.edu>
Message-Id: <199602060453.VAA05705@tiny.mcs.usu.edu>
To: freebsd-hackers@freefall.FreeBSD.org
Subject: silo overflows
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Hello, I recently installed a machine with a BOCA 2016 multiport serial card
in it and have been seeing the occasional (several times a day) silo overflow.
The board has 16 16550A's on it (as reported during boot up.)  Looking in
a manual I have here, it indicates that it's possible to set the receive
trigger level to 1, 4, 8, or 14.  Would there be any chance of clearing up
the problem by moving down to 8 or 4?  I'm not really concerned about too
much cpu load, but data loss is kind of a problem since it leaves the
modems in a bit of a state.

If this seems reasonable what would be the best place to adjust
it at?  Obviously in sio.c, I suspect in the probe routine after
determining the UART type, and setting ftl_init to FIFO_TRIGGER_8 or _4. Is
that correct?

Thanks a bunch,
Kurt Olsen
kurto@tiny.mcs.usu.edu