Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!yale!cmcl2!edith!jan!edler
From: edler@jan.ultra.nyu.edu (Jan Edler)
Newsgroups: comp.sys.ibm.pc.rt
Subject: Re: AOS4.3 Dec 88 async support
Message-ID: <2084@edith.ultra.nyu.edu>
Date: 22 Feb 90 20:54:55 GMT
References: <1781@ursa-major.SPDCC.COM>
Sender: news@edith.ultra.nyu.edu
Organization: New York University, Ultracomputer project
Lines: 21

Steve Dyer reports that he still has input overrun conditions on his
Dec 88 kernel with the buffered 4 port async card, even after applying
the 1.3 fix posted here last summer.

We don't seem to have any problems, but all we're running is 1 or 2
uucp lines at 9600bps.  We did have some problems after applying the
1.3 patch caused by a "bug" in /sys/conf/makefile.ca (missing blank
line at end of file) that caused make depend to screw up.  The symptom
in our case was "Stray Interrupt" messages on the console.  When we
rebuilt the whole kernel, the problem went away.

Async support on the RT has not been one of IBM's strong points (but
I'm not sure the competition does any better).  The planar ports are
almost completely useless under the Dec 88 kernel.  There's no real
excuse for not having bug-free efficient async support, even on
unbuffered ports; I've done it on a much slower machine than the RT.

Jan Edler
NYU Ultracomputer Research Laboratory
edler@nyu.edu
(212) 998-3353