Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!cs.utexas.edu!usc!brutus.cs.uiuc.edu!apple!mips!bridge2!3comvax!tymix!cirrusl!news
From: news@cirrusl.UUCP (USENET News System)
Newsgroups: comp.unix.xenix
Subject: TTY DRIVER PROBLEM UNDER XENIX SYSTEM V
Message-ID: <1384@cirrusl.UUCP>
Date: 28 Feb 90 22:31:06 GMT
Reply-To: saeed@sunseeker (Saeed Talebbeik)
Distribution: all
Organization: Cirrus Logic Inc.
Lines: 12

I have an elusive bug with a tty driver for a multiport intelligent serial
card under SCO XENIX SYSTEM V. My hardware platform is an EVEREX 386 PC.
My test case is simple. I send a i Mb file to all 8 ports at the same time
in the background "cat filename > /dev/dev[1-8] &". The problem is that 
every now and then the whole test case freezes up, the processes go to sleep
on some channel. The xon/xoff handshaking is automatically done by the
board itself. I have increased the number of system clists from 100 to 1000 and
that did not seem to have solved the problem either. I need some debugging 
hints to pinpoint the problem. Is there any way to tell what are the channels
that the processes are sleeping on? Is this a hardware, xenix, or driver 
problem? My speed on all ports is 9600 bits/second. Any coment or help is
greatly appreciated.    Thanks.