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Date:      Fri, 28 Aug 1998 03:11:08 -0400 (EDT)
From:      A Shaw <ash@research.poc.net>
To:        questions@FreeBSD.ORG
Subject:   sio "silo overflows"
Message-ID:  <Pine.BSF.3.96.980828025818.11654B-100000@ouch.oof.net>

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I'm getting a lot of "silo overflows" on the serial port (sio, 16550A, at
57600bps) I use for my 56k PPP dialup.

I found no IRQ conflicts, and both serial ports exhibited the same
behavior, so I halved, then quartered, the high "water mark"
(RS_IHIGHWATER) in sys/i386/isa/sio.c, to try to give the FIFO "more
attention".  There has been so significant reduction in the number of
overflows.

Does anyone have any suggestions?  The machine is a 200MHz/256k P6 (Tyan)
running 2.2.6-RELEASE.

thanks much..

--ash


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